Malformed sav file - need help for investigation

[Ignácz , István]

Greetings,

I think this is not the usual topic on this list, excuse me if you find it
off-topic.

I'm facing a tough bug in my software and I'm looking for some help to be
able to take the next steps.

Our software generates sav files via tiamo's package:
https://packagist.org/packages/tiamo/spss
Usually, everything works fine, but in some cases, we generate malformed
files. In this case, SPSS crashes without any notice, however, PSPP at
least gives a useful error message:
Variable index n refers to long string continuation.

I cannot reproduce this issue on my side, so I tried to reverse engineer
the PSPP codebase to find any cases when it could occur. So far not with
much luck.

Could you help me with some example cases?

Thanks for your help,
István