diff --git a/sable_rapier/src/main/rust/rapier/src/boxes.rs b/sable_rapier/src/main/rust/rapier/src/boxes.rs
index faf5a3ed..c6f86a50 100644
--- a/sable_rapier/src/main/rust/rapier/src/boxes.rs
+++ b/sable_rapier/src/main/rust/rapier/src/boxes.rs
@@ -81,7 +81,10 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_rem
         let sim_data = &mut *sim_data;
         let mut sable_data = scene.sable_data.write().unwrap();
 
-        let handle = sable_data.rigid_bodies[&(id as LevelColliderID)];
+        let Some(handle) = sable_data.rigid_bodies.get(&(id as LevelColliderID)) else {
+            return;
+        };
+        let handle = *handle;
         sim_data.rigid_body_set.remove(
             handle,
             &mut sim_data.island_manager,
diff --git a/sable_rapier/src/main/rust/rapier/src/contraptions.rs b/sable_rapier/src/main/rust/rapier/src/contraptions.rs
index 480cab37..2cf27232 100644
--- a/sable_rapier/src/main/rust/rapier/src/contraptions.rs
+++ b/sable_rapier/src/main/rust/rapier/src/contraptions.rs
@@ -36,11 +36,8 @@ macro_rules! extract_jint_array {
 fn get_kinematic_collider_info(
     sable: &mut SableSceneData,
     id: jint,
-) -> &mut ActiveLevelColliderInfo {
-    sable
-        .level_colliders
-        .get_mut(&(id as LevelColliderID))
-        .expect("No kinematic contraption with given ID!")
+) -> Option<&mut ActiveLevelColliderInfo> {
+    sable.level_colliders.get_mut(&(id as LevelColliderID))
 }
 
 #[unsafe(no_mangle)]
@@ -61,17 +58,16 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_cre
 
         let should_be_static = mount_id == -1;
         let mount_rigid_body = if should_be_static {
-            let new_body = sim_data
-                .rigid_body_set
-                .insert(RigidBodyBuilder::kinematic_position_based());
-            Some(new_body)
-        } else {
             Some(
-                *sable_data
-                    .rigid_bodies
-                    .get(&(mount_id as LevelColliderID))
-                    .unwrap(),
+                sim_data
+                    .rigid_body_set
+                    .insert(RigidBodyBuilder::kinematic_position_based()),
             )
+        } else {
+            sable_data
+                .rigid_bodies
+                .get(&(mount_id as LevelColliderID))
+                .copied()
         };
 
         let mount_rigid_body: RigidBodyHandle = if let Some(body) = mount_rigid_body {
@@ -140,7 +136,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
         let mut sim_data = scene.sim_data.write().unwrap();
         let mut sable_data = scene.sable_data.write().unwrap();
 
-        let info = get_kinematic_collider_info(&mut sable_data, id);
+        let Some(info) = get_kinematic_collider_info(&mut sable_data, id) else {
+            return;
+        };
         let collider_handle = info.collider;
 
         let collider = sim_data.collider_set.get_mut(collider_handle);
@@ -218,7 +216,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
 
     with_handle(handle, |scene| {
         let mut sable_data = scene.sable_data.write().unwrap();
-        let info = get_kinematic_collider_info(&mut sable_data, id);
+        let Some(info) = get_kinematic_collider_info(&mut sable_data, id) else {
+            return;
+        };
         if let Some(chunk_map) = &mut info.chunk_map {
             chunk_map.insert(crate::scene::pack_section_pos(x, y, z), chunk);
         }
@@ -240,8 +240,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_rem
         let sim_data = &mut *sim_data;
         let mut sable_data = scene.sable_data.write().unwrap();
 
-        let info = sable_data.level_colliders.remove(&(id as LevelColliderID));
-        let info = info.unwrap();
+        let Some(info) = sable_data.level_colliders.remove(&(id as LevelColliderID)) else {
+            return;
+        };
 
         sim_data.collider_set.remove(
             info.collider,
diff --git a/sable_rapier/src/main/rust/rapier/src/joints.rs b/sable_rapier/src/main/rust/rapier/src/joints.rs
index 4d99b288..9e042c87 100644
--- a/sable_rapier/src/main/rust/rapier/src/joints.rs
+++ b/sable_rapier/src/main/rust/rapier/src/joints.rs
@@ -329,13 +329,19 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let rb_a = if id_a == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_a as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_a as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let rb_b = if id_b == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_b as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_b as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let revolute = RevoluteJointBuilder::new(
@@ -416,13 +422,19 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let rb_a = if id_a == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_a as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_a as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let rb_b = if id_b == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_b as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_b as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let quat = Quat::from_xyzw(
@@ -508,13 +520,19 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let rb_a = if id_a == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_a as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_a as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let rb_b = if id_b == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_b as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_b as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let mut joint = GenericJointBuilder::new(JointAxesMask::empty()).softness(
@@ -602,13 +620,19 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let rb_a = if id_a == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_a as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_a as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let rb_b = if id_b == -1 {
             scene.ground_handle.unwrap()
         } else {
-            sable_data.rigid_bodies[&(id_b as LevelColliderID)]
+            let Some(rb) = sable_data.rigid_bodies.get(&(id_b as LevelColliderID)) else {
+                return -1;
+            };
+            *rb
         };
 
         let locked_axes = JointAxesMask::from_bits_truncate(locked_axes_mask as u8);
diff --git a/sable_rapier/src/main/rust/rapier/src/lib.rs b/sable_rapier/src/main/rust/rapier/src/lib.rs
index 2d224733..4853496a 100644
--- a/sable_rapier/src/main/rust/rapier/src/lib.rs
+++ b/sable_rapier/src/main/rust/rapier/src/lib.rs
@@ -282,12 +282,9 @@ pub fn get_rigid_body_mut<'a>(
     sim: &'a mut SimulationSceneData,
     sable_data: &SableSceneData,
     id: LevelColliderID,
-) -> &'a mut RigidBody {
-    let handle = sable_data
-        .rigid_bodies
-        .get(&id)
-        .expect("No rigid body for id");
-    &mut sim.rigid_body_set[*handle]
+) -> Option<&'a mut RigidBody> {
+    let handle = sable_data.rigid_bodies.get(&id)?;
+    sim.rigid_body_set.get_mut(*handle)
 }
 
 #[inline(always)]
@@ -295,12 +292,9 @@ pub fn get_rigid_body<'a>(
     sim: &'a SimulationSceneData,
     sable_data: &SableSceneData,
     id: LevelColliderID,
-) -> &'a RigidBody {
-    let handle = sable_data
-        .rigid_bodies
-        .get(&id)
-        .expect("No rigid body for id");
-    &sim.rigid_body_set[*handle]
+) -> Option<&'a RigidBody> {
+    let handle = sable_data.rigid_bodies.get(&id)?;
+    sim.rigid_body_set.get(*handle)
 }
 
 #[unsafe(no_mangle)]
@@ -527,18 +521,22 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_get
         let sable_data = scene.sable_data.read().unwrap();
         let sim_data = scene.sim_data.read().unwrap();
 
-        let rb: &RigidBody =
-            &sim_data.rigid_body_set[sable_data.rigid_bodies[&(id as LevelColliderID)]];
-
-        let arr: [jdouble; 7] = [
-            rb.translation().x as jdouble,
-            rb.translation().y as jdouble,
-            rb.translation().z as jdouble,
-            rb.rotation().x as jdouble,
-            rb.rotation().y as jdouble,
-            rb.rotation().z as jdouble,
-            rb.rotation().w as jdouble,
-        ];
+        let arr: [jdouble; 7] = match sable_data
+            .rigid_bodies
+            .get(&(id as LevelColliderID))
+            .and_then(|body| sim_data.rigid_body_set.get(*body))
+        {
+            Some(rb) => [
+                rb.translation().x as jdouble,
+                rb.translation().y as jdouble,
+                rb.translation().z as jdouble,
+                rb.rotation().x as jdouble,
+                rb.rotation().y as jdouble,
+                rb.rotation().z as jdouble,
+                rb.rotation().w as jdouble,
+            ],
+            None => [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0],
+        };
 
         env.set_double_array_region(&store, 0, &arr).unwrap();
     })
@@ -558,10 +556,12 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
 ) {
     with_handle(handle, |scene| {
         let mut sable_data = scene.sable_data.write().unwrap();
-        let info = sable_data
+        let Some(info) = sable_data
             .level_colliders
             .get_mut(&(id as LevelColliderID))
-            .unwrap();
+        else {
+            return;
+        };
         info.center_of_mass = Some(DVec3::new(x, y, z));
         let mut sim_data = scene.sim_data.write().unwrap();
         update_collider_aabb(&mut sim_data, info);
@@ -593,7 +593,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
             ..
         } = &mut *sable_data;
 
-        let info = level_colliders.get_mut(&(id as LevelColliderID)).unwrap();
+        let Some(info) = level_colliders.get_mut(&(id as LevelColliderID)) else {
+            return;
+        };
         info.set_local_bounds(
             IVec3::new(min_x, min_y, min_z),
             IVec3::new(max_x, max_y, max_z),
@@ -691,10 +693,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_rem
         let mut sable_data = scene.sable_data.write().unwrap();
 
         sable_data.level_colliders.remove(&(id as LevelColliderID));
-        let handle = sable_data
-            .rigid_bodies
-            .remove(&(id as LevelColliderID))
-            .expect("No rigid body for id");
+        let Some(handle) = sable_data.rigid_bodies.remove(&(id as LevelColliderID)) else {
+            return;
+        };
 
         let mut sim_data = scene.sim_data.write().unwrap();
 
@@ -803,9 +804,11 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let chunk = main_level_chunks.get(&pack_section_pos(x, y, z)).unwrap();
         if global == 0 {
             if object_id != -1 {
-                let body = level_colliders
+                let Some(body) = level_colliders
                     .get_mut(&(object_id as LevelColliderID))
-                    .unwrap();
+                else {
+                    return;
+                };
 
                 body.insert_chunk(chunk, x, y, z, collider_map);
             }
@@ -1112,7 +1115,13 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let rb = &mut sim_data.rigid_body_set[sable_data.rigid_bodies[&(id as LevelColliderID)]];
+        let Some(rb) = sable_data
+            .rigid_bodies
+            .get(&(id as LevelColliderID))
+            .and_then(|body| sim_data.rigid_body_set.get_mut(*body))
+        else {
+            return;
+        };
 
         rb.set_additional_mass_properties(
             MassProperties::with_inertia_matrix(Vec3::ZERO, mass as Real, inertia_tensor.into()),
@@ -1142,7 +1151,13 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_tel
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let rb = &mut sim_data.rigid_body_set[sable_data.rigid_bodies[&(id as LevelColliderID)]];
+        let Some(rb) = sable_data
+            .rigid_bodies
+            .get(&(id as LevelColliderID))
+            .and_then(|body| sim_data.rigid_body_set.get_mut(*body))
+        else {
+            return;
+        };
 
         let mut pose = *rb.position();
         pose.translation = Vec3::new(x as Real, y as Real, z as Real);
@@ -1164,7 +1179,13 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_wak
     with_handle(handle, |scene| {
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
-        let rb = &mut sim_data.rigid_body_set[sable_data.rigid_bodies[&(id as LevelColliderID)]];
+        let Some(rb) = sable_data
+            .rigid_bodies
+            .get(&(id as LevelColliderID))
+            .and_then(|body| sim_data.rigid_body_set.get_mut(*body))
+        else {
+            return;
+        };
         rb.wake_up(true);
     })
 }
@@ -1188,7 +1209,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
     with_handle(handle, |scene| {
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
-        let rb = get_rigid_body_mut(&mut sim_data, &sable_data, id as LevelColliderID);
+        let Some(rb) = get_rigid_body_mut(&mut sim_data, &sable_data, id as LevelColliderID) else {
+            return;
+        };
 
         if wake_up == 0 && rb.is_sleeping() {
             return;
@@ -1288,10 +1311,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_app
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let body = sable_data
-            .rigid_bodies
-            .get(&(id as LevelColliderID))
-            .unwrap();
+        let Some(body) = sable_data.rigid_bodies.get(&(id as LevelColliderID)) else {
+            return;
+        };
         let rb = &mut sim_data.rigid_body_set[*body];
 
         if wake_up == 0 && rb.is_sleeping() {
@@ -1333,10 +1355,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_app
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let body = sable_data
-            .rigid_bodies
-            .get(&(id as LevelColliderID))
-            .unwrap();
+        let Some(body) = sable_data.rigid_bodies.get(&(id as LevelColliderID)) else {
+            return;
+        };
         let rb = &mut sim_data.rigid_body_set[*body];
 
         if wake_up == 0 && rb.is_sleeping() {
@@ -1370,10 +1391,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_get
         let sable_data = scene.sable_data.read().unwrap();
         let sim_data = scene.sim_data.read().unwrap();
 
-        let body = sable_data
-            .rigid_bodies
-            .get(&(id as LevelColliderID))
-            .unwrap();
+        let Some(body) = sable_data.rigid_bodies.get(&(id as LevelColliderID)) else {
+            return;
+        };
         let rb = &sim_data.rigid_body_set[*body];
 
         let vel = rb.linvel();
@@ -1402,10 +1422,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_get
         let sable_data = scene.sable_data.read().unwrap();
         let sim_data = scene.sim_data.read().unwrap();
 
-        let body = sable_data
-            .rigid_bodies
-            .get(&(id as LevelColliderID))
-            .unwrap();
+        let Some(body) = sable_data.rigid_bodies.get(&(id as LevelColliderID)) else {
+            return;
+        };
         let rb = &sim_data.rigid_body_set[*body];
 
         let vel = rb.angvel();
diff --git a/sable_rapier/src/main/rust/rapier/src/rope.rs b/sable_rapier/src/main/rust/rapier/src/rope.rs
index 84a31010..7680df75 100644
--- a/sable_rapier/src/main/rust/rapier/src/rope.rs
+++ b/sable_rapier/src/main/rust/rapier/src/rope.rs
@@ -51,8 +51,11 @@ pub fn tick(scene: &PhysicsScene) {
 
     for (id, rope) in sable_data.rope_map.ropes.iter() {
         if let Some(attachment) = &rope.start_attachment {
-            if !sim.impulse_joint_set.contains(attachment.joint) {
-                dead_start_attachments.push(id.clone());
+            let endpoint_gone = attachment
+                .sub_level_id
+                .is_some_and(|id_b| !sable_data.level_colliders.contains_key(&id_b));
+            if !sim.impulse_joint_set.contains(attachment.joint) || endpoint_gone {
+                dead_start_attachments.push(*id);
             } else {
                 let local_anchor = attachment.location
                     - if let Some(id_b) = attachment.sub_level_id {
@@ -71,8 +74,11 @@ pub fn tick(scene: &PhysicsScene) {
         }
 
         if let Some(attachment) = &rope.end_attachment {
-            if !sim.impulse_joint_set.contains(attachment.joint) {
-                dead_end_attachments.push(id.clone());
+            let endpoint_gone = attachment
+                .sub_level_id
+                .is_some_and(|id_b| !sable_data.level_colliders.contains_key(&id_b));
+            if !sim.impulse_joint_set.contains(attachment.joint) || endpoint_gone {
+                dead_end_attachments.push(*id);
             } else {
                 let local_anchor = attachment.location
                     - if let Some(id_b) = attachment.sub_level_id {
@@ -265,7 +271,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_que
         let sable_data = scene.sable_data.read().unwrap();
         let sim_data = scene.sim_data.read().unwrap();
 
-        let strand = sable_data.rope_map.ropes.get(&(id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.get(&(id as usize)) else {
+            return env.new_double_array(0).unwrap();
+        };
 
         let flattened: Vec<jdouble> = strand
             .points
@@ -303,7 +311,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_rem
         let mut sim_data = scene.sim_data.write().unwrap();
         let sim_data = &mut *sim_data;
 
-        let strand = sable_data.rope_map.ropes.remove(&(id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.remove(&(id as usize)) else {
+            return;
+        };
         for handle in strand.points {
             sim_data.rigid_body_set.remove(
                 handle,
@@ -332,7 +342,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
         let mut sable_data = scene.sable_data.write().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let strand = sable_data.rope_map.ropes.get_mut(&(id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.get_mut(&(id as usize)) else {
+            return;
+        };
 
         strand.first_joint_length = length as Real;
         let first_joint = &mut sim_data
@@ -364,7 +376,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_rem
         let mut sim_data = scene.sim_data.write().unwrap();
         let sim_data = &mut *sim_data;
 
-        let strand = sable_data.rope_map.ropes.get_mut(&(id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.get_mut(&(id as usize)) else {
+            return;
+        };
         let point = strand.points.remove(0);
         strand.joints.remove(0);
         sim_data.rigid_body_set.remove(
@@ -415,7 +429,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_add
         let mut sable_data = scene.sable_data.write().unwrap();
         let universal_drag = scene.universal_drag;
 
-        let strand = sable_data.rope_map.ropes.get_mut(&(id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.get_mut(&(id as usize)) else {
+            return;
+        };
         let point_radius = strand.point_radius;
 
         // set joint that will no longer be the first
@@ -464,7 +480,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_wak
         let sable_data = scene.sable_data.read().unwrap();
         let mut sim_data = scene.sim_data.write().unwrap();
 
-        let strand = sable_data.rope_map.ropes.get(&(rope_id as usize)).unwrap();
+        let Some(strand) = sable_data.rope_map.ropes.get(&(rope_id as usize)) else {
+            return;
+        };
 
         for point in &strand.points {
             sim_data
@@ -501,7 +519,9 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
             ..
         } = &mut *sable_data;
 
-        let strand = rope_map.ropes.get_mut(&(rope_id as usize)).unwrap();
+        let Some(strand) = rope_map.ropes.get_mut(&(rope_id as usize)) else {
+            return;
+        };
 
         let rope_body = if end > 0 {
             strand.points.last()
@@ -512,9 +532,10 @@ pub extern "system" fn Java_dev_ryanhcode_sable_physics_impl_rapier_Rapier3D_set
         let sub_level_body = if sub_level_id == -1 {
             ground_handle
         } else {
-            *rigid_bodies
-                .get(&(sub_level_id as LevelColliderID))
-                .unwrap()
+            let Some(rb) = rigid_bodies.get(&(sub_level_id as LevelColliderID)) else {
+                return;
+            };
+            *rb
         };
 
         let joint = RopeJointBuilder::new(0.0)