1 files changed, 6 insertions, 1 deletions
diff --git a/src/geometry/collider_set.rs b/src/geometry/collider_set.rs
index 7af34f1..7b453a3 100644
--- a/src/geometry/collider_set.rs
+++ b/src/geometry/collider_set.rs
@@ -139,7 +139,12 @@ impl ColliderSet {
             self.modified_all_colliders = false;
         } else {
             for handle in self.modified_colliders.drain(..) {
-                self.colliders[handle.0].changes = ColliderChanges::empty();
+                // NOTE: if the collider was added, then removed from this set before
+                //       a an update, then it will no longer exist in `self.colliders`
+                //       so we need to do this `if let`.
+                if let Some(co) = self.colliders.get_mut(handle.0) {
+                    co.changes = ColliderChanges::empty();
+                }
             }
         }
     }