Hello, I experienced one more other error.

Error message:
At _history_add_planetary_events function in timeline.py,
"AttributeError: 'Session' object has no attribute 'update'"

My debugging:
It happens when a system is renamed after previous savedata.
Dashboard catches it and try to update with new system name, but failed.
I know very little about get_db_session function, but it sounds this function doesn't have 'update' attribute.

My fix:
I change the attribute to 'add', and Dashboard succeeds to run.
That said, I am not sure it is right solution.