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Realtime Connection Error After Updating to Latest Server and Flutter SDK Version.

  • 0
  • Flutter
  • Realtime
  • Cloud
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AndresR
27 Feb, 2026, 23:08

I get the following error message now when the realtime subscription picks up a new message. There's more to the error but it makes the discord message too long. It used to work before updating sdk and server versions. Thanks for your help!

[ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: type '_Map<String, dynamic>' is not a subtype of type 'Iterable<dynamic>' #0 new RealtimeMessage.fromMap (package:appwrite/src/realtime_message.dart:57:47) realtime_message.dart:57 #1 RealtimeMixin._createSocket.<anonymous closure> (package:appwrite/src/realtime_mixin.dart:134:45) realtime_mixin.dart:134 #2 _RootZone.runUnaryGuarded (dart:async/zone.dart:1778:10) zone.dart:1778 #3 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:381:11) stream_impl.dart:381 #4 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:312:7) stream_impl.dart:312 #5 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:798:19) stream_controller.dart:798 #6 _StreamController._add (dart:async/stream_controller.dart:663:7) stream_controller.dart:663 #7 _StreamController.add (dart:async/stream_controller.dart:618:5) stream_controller.dart:618 #8 _RootZone.runUnaryGuarded (dart:async/zone.dart:1778:10) zone.dart:1778 #9 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:381:11) stream_impl.dart:381 #10 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:312:7) stream_impl.dart:312 #11 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:798:19) stream_controller.dart:798

Code Snippet final String databaseId = dotenv.get('APPWRITEDATABASEID'); final String messagesTableId = dotenv.get('APPWRITEMESSAGESCOLLECTION'); final channel = 'databases.$databaseId.tables.$messagesTableId.rows';

TypeScript
_collectionSubscription = _realtime.subscribe([channel]);

_collectionSubscription!.stream.listen((response) {
TL;DR
Developers are experiencing a type error after updating their Flutter SDK and server versions. The issue seems to be related to a subtype error when attempting to handle a Realtime Message. Solution: The error is likely due to changes in the returned data structure. Developers should review RealtimeMessage.fromMap to ensure it correctly handles the updated data type.
AndresR
27 Feb, 2026, 23:15

I am getting this message in my logs so it looks like it's setup correctly. flutter: Received heartbeat response from realtime server.

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