patrol_cli 3.4.0 crashes with Unhandled exception: FormatException: Missing extension byte at offset

[EvgenSilkov]

I made quite a lot of tests to run. On patrol 3.12.0 patrol_cli 3.3.0 it worked like a charm.
patrol_cli 3.4.1 with smiles in console crashes semi-randomly midrun on different tests while trying to put test result to the console. Tests keep running, but console supervisor is shut down.
Tests are quite different, message, though, is the same (provided below)
I can't pinpoint it to a specific character in test. When trying to run smaller amount of tests it passes without a hitch.
I can't reproduce it consistently so I'm not bothering developers with filling issue.

Did anyone get something similar? Maybe someone has an idea what can cause the problem?

Unhandled exception:
FormatException: Missing extension byte (at offset 1066)
#0      _Utf8Decoder.convertChunked (dart:convert-patch/convert_patch.dart:1956:7)
#1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:304:28)
#2      _Utf8ConversionSink.add (dart:convert/string_conversion.dart:300:5)
#3      _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:69:18)
#4      _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:111:24)
#5      _RootZone.runUnaryGuarded (dart:async/zone.dart:1594:10)
#6      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:365:11)
#7      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:297:7)
#8      _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:784:19)
#9      _StreamController._add (dart:async/stream_controller.dart:658:7)
#10     _StreamController.add (dart:async/stream_controller.dart:606:5)
#11     _Socket._onData (dart:io-patch/socket_patch.dart:2455:41)
#12     _RootZone.runUnaryGuarded (dart:async/zone.dart:1594:10)
#13     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:365:11)
#14     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:297:7)
#15     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:784:19)
#16     _StreamController._add (dart:async/stream_controller.dart:658:7)
#17     _StreamController.add (dart:async/stream_controller.dart:606:5)
#18     new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1942:33)
#19     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1385:14)
#20     _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#21     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)
#22     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#23     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:185:5)