diff --git a/src/main/java/com/cleanroommc/modularui/screen/ModularContainer.java b/src/main/java/com/cleanroommc/modularui/screen/ModularContainer.java
index 2a29216aa..7fbe7052c 100644
--- a/src/main/java/com/cleanroommc/modularui/screen/ModularContainer.java
+++ b/src/main/java/com/cleanroommc/modularui/screen/ModularContainer.java
@@ -366,6 +366,7 @@ public ItemStack slotClick(int slotId, int mouseButton, int mode, EntityPlayer p
                 Slot fromSlot = getSlot(slotId);
                 ItemStack fromItem = fromSlot.getStack();
                 ItemStack hotbarStack = hotbarSlot.getStack();
+                if (hotbarSlot == fromSlot) return null;
                 if (fromItem != null && !hotbarSlot.isItemValid(fromItem)) return null;
                 if (hotbarStack != null && !hotbarSlot.canTakeStack(player)) return null;
             }