diff --git a/src/matrix/room/common.ts b/src/matrix/room/common.ts
index 5a7fc98e..4556302f 100644
--- a/src/matrix/room/common.ts
+++ b/src/matrix/room/common.ts
@@ -80,7 +80,7 @@ export function iterateResponseStateEvents(roomResponse: RoomResponse, callback:
         }
     }
     if (promises) {
-        return Promise.all(promises);
+        return Promise.all(promises).then(() => undefined);
     }
 }