diff --git a/README.md b/README.md
index 3038799..f64f368 100644
--- a/README.md
+++ b/README.md
@@ -245,8 +245,8 @@ That will generate the rom at `/build/portal64.z64`
 ## Current New Feature TODO List
 - [ ] test chamber 10 without jumping
 - [ ] check if display list is long enough 
-- [ ] check collider flags when filtering contacts
 - [ ] pausing while glados is speaking can end her speech early
+- [x] check collider flags when filtering contacts
 - [x] gun flicker between levels
 - [x] fizzler player sound effect
 - [x] clear z buffer instead of partitioning it
diff --git a/src/physics/contact_solver.c b/src/physics/contact_solver.c
index 79a9701..bdefaa4 100644
--- a/src/physics/contact_solver.c
+++ b/src/physics/contact_solver.c
@@ -25,6 +25,11 @@ struct ContactSolver gContactSolver;
 void contactSolverCleanupManifold(struct ContactManifold* manifold) {
 	int writeIndex = 0;
 
+	if (!(manifold->shapeA->collisionLayers & manifold->shapeB->collisionLayers)) {
+		manifold->contactCount = 0;
+		return;
+	}
+
 	for (int readIndex = 0; readIndex < manifold->contactCount; ++readIndex) {
 		struct ContactPoint* contactPoint = &manifold->contacts[readIndex];
 		struct Vector3 offset;