diff --git a/src/MaterialEditor.Base/UI/Refresh/UI.MaterialEditorRefreshController.cs b/src/MaterialEditor.Base/UI/Refresh/UI.MaterialEditorRefreshController.cs
index c7fb2dbb..78eda77a 100644
--- a/src/MaterialEditor.Base/UI/Refresh/UI.MaterialEditorRefreshController.cs
+++ b/src/MaterialEditor.Base/UI/Refresh/UI.MaterialEditorRefreshController.cs
@@ -57,11 +57,12 @@ private int ScheduleDeferredPopulate(GameObject go, object data, string filter)
                 {
                     _deferredRefreshCoroutine = _host.StartRefreshCoroutine(DeferredPopulateWorker());
                     if (_deferredRefreshCoroutine == null)
-                        _deferredRefresh.WorkerStopped();
+                        // No worker can finish this request or release its waiters.
+                        _deferredRefresh.Cancel();
                 }
                 catch
                 {
-                    _deferredRefresh.WorkerStopped();
+                    _deferredRefresh.Cancel();
                     throw;
                 }
             }