Crash at startup when directory content isnt writeable

[alcapitan]

1. When the app (installed through Snap) was ok, I tried to open the /tmp directory with some musics as well as many /tmp stuff.
2. However, the app dont work anymore, it crashes at startup. Look at the error :

alex@latitude3510:~$ tagger
MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:763: FINISHME: support YUV colorspace with DRM format modifiers
MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:794: FINISHME: support more multi-planar formats with DRM modifiers
UnhandledException - unhandled exception: System.UnauthorizedAccessException: Access to the path '/run/user/1000/doc/a4c6349b/tmp/systemd-private-09d538a55e7b444c82b5ce816f53b7cf-fwupd.service-HBpOKt' is denied.
 ---> System.IO.IOException: Permission denied
   --- End of inner exception stack trace ---
and a lot of following blabla

Understand that the problem is the protected system files in /tmp.
So, could you fix the app to ignore protected content or open at startup without directory for example ?
Thx for the work ;-)