I am able to reproduce this issue on the latest master and stable channels.

Details

Oops; flutter has exited unexpectedly: "FormatException: Unexpected character (at character 1)
The Dart VM service is listening on http://127.0.0.1:50245/vBMtGcJD6io=/
^
".
Oops; flutter has exited unexpectedly: "FormatException: Unexpected character (at character 1)
The Dart VM service is listening on http://127.0.0.1:50245/vBMtGcJD6io=/
^
".
A crash report has been written to /Users/dammya/triage/flutter_master/flutter_01.log.
This crash may already be reported. Check GitHub for similar crashes.
https://github.com/flutter/flutter/issues?q=is%3Aissue+FormatException%3A+Unexpected+character+%28at+character+1%29%0AThe+Dart+VM+service+is+listening+on+http%3A%2F%2F127.0.0.1%3A49999%2FrXEN7QEU3b4%3D%2F%0A%5E%0A

To report your crash to the Flutter team, first read the guide to filing a bug.
https://flutter.dev/docs/resources/bug-reports

Create a new GitHub issue by pasting this link into your browser and completing the issue template. Thank you!
https://github.com/flutter/flutter/issues/new?title=%5Btool_crash%5D+FormatException&body=%23%23+Command%0A%60%60%60%0Aflutter+analyze+--watch%0A%60%60%60%0A%0A%23%23+Steps+to+Reproduce%0A1.+...%0A2.+...%0A3.+...%0A%0A%23%23+Logs%0AFormatException%0A%60%60%60%0A%230++++++_ChunkedJsonParser.fail+%28dart%3Aconvert-patch%2Fconvert_patch.dart%3A1383%3A5%29%0A%231++++++_ChunkedJsonParser.parseNumber+%28dart%3Aconvert-patch%2Fconvert_patch.dart%3A1250%3A9%29%0A%232++++++_ChunkedJsonParser.parse+%28dart%3Aconvert-patch%2Fconvert_patch.dart%3A915%3A22%29%0A%233++++++_parseJson+%28dart%3Aconvert-patch%2Fconvert_patch.dart%3A35%3A10%29%0A%234++++++JsonDecoder.convert+%28dart%3Aconvert%2Fjson.dart%3A610%3A36%29%0A%235++++++JsonCodec.decode+%28dart%3Aconvert%2Fjson.dart%3A216%3A41%29%0A%236++++++AnalysisServer._handleServerResponse+%28package%3Aflutter_tools%2Fsrc%2Fdart%2Fanalysis.dart%3A140%3A35%29%0A%237++++++_rootRunUnary+%28dart%3Aasync%2Fzone.dart%3A1406%3A47%29%0A%238++++++_CustomZone.runUnary+%28dart%3Aasync%2Fzone.dart%3A1307%3A19%29%0A%239++++++_CustomZone.runUnaryGuarded+%28dart%3Aasync%2Fzone.dart%3A1216%3A7%29%0A%2310+++++_BufferingStreamSubscription._sendData+%28dart%3Aasync%2Fstream_impl.dart%3A339%3A11%29%0A%2311+++++_BufferingStreamSubscription._add+%28dart%3Aasync%2Fstream_impl.dart%3A271%3A7%29%0A%2312+++++_SinkTransformerStreamSubscription._add+%28dart%3Aasync%2Fstream_transformers.dart%3A63%3A11%29%0A%2313+++++_EventSinkWrapper.add+%28dart%3Aasync%2Fstream_transformers.dart%3A13%3A11%29%0A%2314+++++_StringAdapterSink.add+%28dart%3Aconvert%2Fstring_conversion.dart%3A238%3A11%29%0A%2315+++++_LineSplitterSink._addLines+%28dart%3Aconvert%2Fline_splitter.dart%3A153%3A13%29%0A%2316+++++_LineSplitterSink.addSlice+%28dart%3Aconvert%2Fline_splitter.dart%3A128%3A5%29%0A%2317+++++StringConversionSinkMixin.add+%28dart%3Aconvert%2Fstring_conversion.dart%3A163%3A5%29%0A%2318+++++_SinkTransformerStreamSubscription._handleData+%28dart%3Aasync%2Fstream_transformers.dart%3A111%3A24%29%0A%2319+++++_rootRunUnary+%28dart%3Aasync%2Fzone.dart%3A1406%3A47%29%0A%2320+++++_CustomZone.runUnary+%28dart%3Aasync%2Fzone.dart%3A1307%3A19%29%0A%2321+++++_CustomZone.runUnaryGuarded+%28dart%3Aasync%2Fzone.dart%3A1216%3A7%29%0A%2322+++++_BufferingStreamSubscription._sendData+%28dart%3Aasync%2Fstream_impl.dart%3A339%3A11%29%0A%2323+++++_BufferingStreamSubscription._add+%28dart%3Aasync%2Fstream_impl.dart%3A271%3A7%29%0A%2324+++++_SinkTransformerStreamSubscription._add+%28dart%3Aasync%2Fstream_transformers.dart%3A63%3A11%29%0A%60%60%60%0A%60%60%60%0A%1B%5B32m%5B%E2%9C%93%5D%1B%5B39m+Flutter+%28Channel+stable%2C+3.7.12%2C+on+macOS+13.3+22E252+darwin-arm64%2C+locale+en-NG%29%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Flutter+version+3.7.12+on+channel+stable+at+%2FUsers%2Fdammya%2Fsdks%2Fflutter%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Upstream+repository+https%3A%2F%2Fgithub.com%2Fflutter%2Fflutter.git%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Framework+revision+4d9e56e694+%283+weeks+ago%29%2C+2023-04-17+21%3A47%3A46+-0400%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Engine+revision+1a65d409c7%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Dart+version+2.19.6%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+DevTools+version+2.20.1%0A%0A%1B%5B32m%5B%E2%9C%93%5D%1B%5B39m+Android+toolchain+-+develop+for+Android+devices+%28Android+SDK+version+32.1.0-rc1%29%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Android+SDK+at+%2FUsers%2Fdammya%2FLibrary%2FAndroid%2Fsdk%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Platform+android-33%2C+build-tools+32.1.0-rc1%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+ANDROID_HOME+%3D+%2FUsers%2Fdammya%2FLibrary%2FAndroid%2Fsdk%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Java+binary+at%3A+%2FApplications%2FAndroid+Studio.app%2FContents%2Fjre%2FContents%2FHome%2Fbin%2Fjava%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Java+version+OpenJDK+Runtime+Environment+%28build+11.0.12%2B0-b1504.28-7817840%29%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+All+Android+licenses+accepted.%0A%0A%1B%5B32m%5B%E2%9C%93%5D%1B%5B39m+Xcode+-+develop+for+iOS+and+macOS+%28Xcode+14.3%29%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Xcode+at+%2FApplications%2FXcode.app%2FContents%2FDeveloper%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Build+14E222b%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+CocoaPods+version+1.11.3%0A%0A%1B%5B32m%5B%E2%9C%93%5D%1B%5B39m+Chrome+-+develop+for+the+web%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Chrome+at+%2FApplications%2FGoogle+Chrome.app%2FContents%2FMacOS%2FGoogle+Chrome%0A%0A%1B%5B32m%5B%E2%9C%93%5D%1B%5B39m+Android+Studio+%28version+2021.2%29%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Android+Studio+at+%2FApplications%2FAndroid+Studio.app%2FContents%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Flutter+plugin+can+be+installed+from%3A%0A++++++%F0%9F%94%A8+https%3A%2F%2Fplugins.jetbrains.com%2Fplugin%2F9212-flutter%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Dart+plugin+can+be+installed+from%3A%0A++++++%F0%9F%94%A8+https%3A%2F%2Fplugins.jetbrains.com%2Fplugin%2F6351-dart%0A++++%1B%5B32m%E2%80%A2%1B%5B39m+Java+version+OpenJDK+Runtime+Environment+%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Flutter tool crashes when you type Ctrl-\ #58391

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