When Navis crashes, you can choose to view details; the two files have:
a state of the application
a report of your setup.
I’m not interested in what you have installed on your machine, but the NavisWorksErrorReport.dmp has the stack trace for the error.
It can usually be found at: C:\Users\__USER__\AppData\Local\Temp\NavisWorksErrorReport.dmp
Not a lot to go on there, either. All it is reporting is it tried to access a Navisworks object that no longer existed. Navis is aggressive with its memory management - I will double down again on GC optimisations.
The next release (2.15) should make far fewer IO trips to the memory store, which could remove this annoyance.
In the meantime, let us know if this is anything approaching a regular event.