Conversion job fails with audio only in certain order

Issue type

Import/export issue

Description with steps to reproduce

A convertion job fails, when there is a wav conversion as the last (but not only) conversion in the batch

Reproduction:

1. Write a job.json with a convertion to .wav as the last, but not only element.
2. Run musescore --job job.json
3. Observe

This is the error:

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_M_construct null not valid
/tmp/.mount_MuseSchCfjEb/AppRun: line 26: 32532 Aborted                 (core dumped) "${APPDIR}/bin/mscore4portable" "$@"

Supporting files, videos and screenshots

In which versions of MuseScore Studio is this issue present?

4.6.5 Linux x86_64

Regression

Choose option...

Operating system

Ubuntu 24.04

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

Start by reproducing the failure on Linux with MuseScore 4.6.5 using a job.json containing multiple conversions, with .wav last, and run musescore --job job.json. Trace the batch conversion path and handling of the final audio conversion. Done means the same batch completes without the basic_string::_M_construct null not valid exception.