when handler crashes stack trace posted as a string rather than a list

[velimir]

{
  "stackTrace": "[{erllambda_crash_handler,handle,2,\n                          [{file,\"/Users/gstarinkin/src/erllambda/_build/test/lib/erllambda/test/erllambda_crash_handler.erl\"},\n                           {line,11}]},\n {erllambda,invoke_exec,3,\n            [{file,\"/Users/gstarinkin/src/erllambda/_build/test/lib/erllambda/src/erllambda.erl\"},\n             {line,307}]},\n {erllambda,'-invoke/3-fun-0-',4,\n            [{file,\"/Users/gstarinkin/src/erllambda/_build/test/lib/erllambda/src/erllambda.erl\"},\n             {line,288}]}]",
  "errorType": "HandlerFailure",
  "errorMessage": "terminated with exception {error, {badmatch,<<\"foobaz\">>}}"
}