diff --git a/js/Disposable.ts b/js/Disposable.ts
index 79b96a69..1df27546 100644
--- a/js/Disposable.ts
+++ b/js/Disposable.ts
@@ -30,6 +30,7 @@ export default class Disposable {
         teardown.dispose();
       }
     });
+    this._teardowns = [];
     this.disposed = true;
   }
 }