json chunk error

[bsutton]

nginx-le/shared$ critical_test
Logging all output to /tmp/critical_test/unit_test.log
Unhandled exception:
FormatException: Unexpected character (at character 127)
...2282}Sending 978 nginx: [emerg] unexpected end of file, expecting ";" or "}

0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1405:5)
#1 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:935:48)
#2 _parseJson (dart:convert-patch/convert_patch.dart:40:10)
#3 JsonDecoder.convert (dart:convert/json.dart:506:36)
#4 JsonCodec.decode (dart:convert/json.dart:157:41)
#5 jsonDecode (dart:convert/json.dart:96:10)
#6 ProcessOutput.processOutput (package:critical_test/src/process_output.dart:77:17)
#7 _runTestScript. (package:critical_test/src/run.dart:208:48)