diff --git a/pyproject.toml b/pyproject.toml
index 9c184f3..ede476f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "MBTAclient"
-version = "1.1.30"
+version = "1.1.31"
 description = "A Python client for interacting with the MBTA API"
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/src/mbtaclient/handlers/base_handler.py b/src/mbtaclient/handlers/base_handler.py
index ddacea7..71fcd49 100644
--- a/src/mbtaclient/handlers/base_handler.py
+++ b/src/mbtaclient/handlers/base_handler.py
@@ -484,6 +484,8 @@ def _filter_and_sort_trips(
                 if require_both_stops and (
                     not departure_stop
                     or not arrival_stop
+                    or departure_stop.stop_sequence is None  # <-- FIX for #29
+                    or arrival_stop.stop_sequence is None   # <-- FIX for #29
                     or departure_stop.stop_sequence > arrival_stop.stop_sequence
                 ):
                     continue