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That's the solution! Thanks a lot!

Thank you for your answer! Yes, its the same problem as with the verbatim environment. The problem I described is a minimal example - the original file is a lot more complex. I use a self made command to style exercises for the exams of my students. The command gets the text of the exercise, the max ...

I have defined a function called \test that just prints its parameter and before it prints the word "Code: ". In the document I call the function \test with a parameter that contains a listings enviroment. Unfortunately I always get an error message: Emergency stop. Fatal error occurred, no output ...