diff --git a/lib/src/event.dart b/lib/src/event.dart
index 30d5606c..ba2e2894 100644
--- a/lib/src/event.dart
+++ b/lib/src/event.dart
@@ -129,7 +129,7 @@ class Event extends MatrixEvent {
         final json = toJson();
         json['unsigned'] ??= <String, dynamic>{};
         json['unsigned'][messageSendingStatusKey] = -1;
-        room.client.handleSync(SyncUpdate()
+        room.client.handleSync(SyncUpdate(nextBatch: '')
           ..rooms = (RoomsUpdate()
             ..join = (<String, JoinedRoomUpdate>{}..[room.id] =
                 (JoinedRoomUpdate()