[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Null check operator used on a null value

[niluved]

Hi there!
Just upgraded my project to Flutter 3.10.2 / Dart 3.0.2 and i fear something is broken now.
I have dart_openai: ^1.9.93 and http: ^0.13.6 in my pubspec.yaml (nothing changes even reverting to some minor versions such as dart_openai 1.9.91 or http 0.13.5 which were working great before my flutter upgrade).

My android app listens to a Stream to update a list of strings and return some info on the screen but now, when the stream response is done, nothing is displayed and i get the following lines in the console:

[OpenAI] stream response is done
E/flutter (11371): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Null check operator used on a null value
E/flutter (11371): #0 OpenAINetworkingClient.postStream.close
client.dart:264
E/flutter (11371): #1 OpenAINetworkingClient.postStream..
client.dart:317
E/flutter (11371): #2 _RootZone.runGuarded (dart:async/zone.dart:1582:10)
E/flutter (11371): #3 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
E/flutter (11371): #4 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7)
E/flutter (11371): #5 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7)
E/flutter (11371): #6 _SinkTransformerStreamSubscription._close (dart:async/stream_transformers.dart:87:11)
E/flutter (11371): #7 _EventSinkWrapper.close (dart:async/stream_transformers.dart:21:11)
E/flutter (11371): #8 _StringAdapterSink.close (dart:convert/string_conversion.dart:241:11)
E/flutter (11371): #9 _LineSplitterSink.close (dart:convert/line_splitter.dart:141:11)
E/flutter (11371): #10 _SinkTransformerStreamSubscription._handleDone (dart:async/stream_transformers.dart:132:24)
E/flutter (11371): #11 _RootZone.runGuarded (dart:async/zone.dart:1582:10)
E/flutter (11371): #12 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
E/flutter (11371): #13 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7)
E/flutter (11371): #14 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7)
E/flutter (11371): #15 _SinkTransformerStreamSubscription._close (dart:async/stream_transformers.dart:87:11)
E/flutter (11371): #16 _EventSinkWrapper.close (dart:async/stream_transformers.dart:21:11)
E/flutter (11371): #17 _StringAdapterSink.close (dart:convert/string_conversion.dart:241:11)
E/flutter (11371): #18 _Utf8ConversionSink.close (dart:convert/string_conversion.dart:295:20)
E/flutter (11371): #19 _ConverterStreamEventSink.close (dart:convert/chunked_conversion.dart:78:18)
E/flutter (11371): #20 _SinkTransformerStreamSubscription._handleDone (dart:async/stream_transformers.dart:132:24)
E/flutter (11371): #21 _RootZone.runGuarded (dart:async/zone.dart:1582:10)
E/flutter (11371): #22 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
E/flutter (11371): #23 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7)
E/flutter (11371): #24 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7)
E/flutter (11371): #25 _ForwardingStream._handleDone (dart:async/stream_pipe.dart:99:10)
E/flutter (11371): #26 _ForwardingStreamSubscription._handleDone (dart:async/stream_pipe.dart:161:13)
E/flutter (11371): #27 _HttpClientResponse.listen. (dart:_http/http_impl.dart:726:15)
E/flutter (11371): #28 _RootZone.runGuarded (dart:async/zone.dart:1582:10)
E/flutter (11371): #29 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
E/flutter (11371): #30 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7)
E/flutter (11371): #31 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7)
E/flutter (11371): #32 _ForwardingStream._handleDone (dart:async/stream_pipe.dart:99:10)
E/flutter (11371): #33 _ForwardingStreamSubscription._handleDone (dart:async/stream_pipe.dart:161:13)
E/flutter (11371): #34 _RootZone.runGuarded (dart:async/zone.dart:1582:10)
E/flutter (11371): #35 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:392:13)
E/flutter (11371): #36 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:402:7)
E/flutter (11371): #37 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:291:7)
E/flutter (11371): #38 _SyncStreamControllerDispatch._sendDone (dart:async/stream_controller.dart:784:19)
E/flutter (11371): #39 _StreamController._closeUnchecked (dart:async/stream_controller.dart:639:7)
E/flutter (11371): #40 _StreamController.close (dart:async/stream_controller.dart:632:5)
E/flutter (11371): #41 _HttpParser._closeIncoming (dart:_http/http_parser.dart:1147:18)
E/flutter (11371): #42 _HttpParser._doParse (dart:_http/http_parser.dart:813:11)
E/flutter (11371): #43 _HttpParser._parse (dart:_http/http_parser.dart:319:7)
E/flutter (11371): #44 _HttpParser._onData (dart:_http/http_parser.dart:873:5)
E/flutter (11371): #45 _RootZone.runUnaryGuarded (dart:async/zone.dart:1594:10)
E/flutter (11371): #46 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (11371): #47 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
E/flutter (11371): #48 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:776:19)
E/flutter (11371): #49 _StreamController._add (dart:async/stream_controller.dart:650:7)
E/flutter (11371): #50 _StreamController.add (dart:async/stream_controller.dart:598:5)
E/flutter (11371): #51 _Socket._onData (dart:io-patch/socket_patch.dart:2368:41)
E/flutter (11371): #52 _RootZone.runUnaryGuarded (dart:async/zone.dart:1594:10)
E/flutter (11371): #53 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (11371): #54 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
E/flutter (11371): #55 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:776:19)
E/flutter (11371): #56 _StreamController._add (dart:async/stream_controller.dart:650:7)
E/flutter (11371): #57 _StreamController.add (dart:async/stream_controller.dart:598:5)
E/flutter (11371): #58 _RawSecureSocket._sendReadEvent (dart:io/secure_socket.dart:1114:19)
E/flutter (11371): #59 Timer._createTimer. (dart:async-patch/timer_patch.dart:18:15)
E/flutter (11371): #60 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
E/flutter (11371): #61 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
E/flutter (11371): #62 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)
E/flutter (11371):

i guess the app gets stuck in client.dart at the lines 264 and 317, but i don't want to mess up with that file.
what can i do?

thanks

[mengcodecn]

There is the same problem

[anasfik]

Hello, Thank you for reaching here about that issue.

And yes, it was an issue with the add of custom HTTP client property to the package methods which results in to immediate call of close() if that client is null.

Please, I did fix all of that in version 2.0.0, it passes all tests and so you should have it working just fine as you expect now!