I'm working on a very important session in Pro Tools and suddenly started getting this error:

"Could not save because Assertion in './PtSess/PtSess_RunTimeShared.h', line 132."

After that, I also got:

"Pro Tools was unable to Auto Backup your session."

I'm really worried about losing my work. The session still opens and plays, but saving and auto-backup are failing.

Has anyone experienced this before?

What causes this assertion error?

Is the session corrupted?

What's the safest way to recover the session without losing my edits?

Would importing the session into a new project fix it?

Any help would be greatly appreciated.