injecting groovy Env variables - Exception not shown

Whenever an exception comes up using *.groovy code to "inject environment variables to the build process", the exception and it´s message/stacktrace is not shown in the console / log:

Only this line can be seen:

[EnvInject] - [ERROR] - [EnvInject] - [ERROR] - Problems occurs on injecting env vars as a build wrap: null

The code to reproduce this looks for example just like:

def map = [ myKey: "myValue" ]

// Exceptiion will NOT be reported
map.createException()

return map

See also the attached file for a sample job.

Please report the exception, so analyzing the problem would be much easier.