I'll look into it further...
Meanwhile:
It looks like you have an Extension loaded which doesn't report a Version in the Extension Manager - if it returns '' it ought to be OK, but with a nil it cause the trip hazard.
A known cause is some of Chuck Vali's stuff.
But the nil return was trapped for this very reason.
Can you check your Extensions and unload any without a Version set, and see it SketchUcation then loads on a restart. And let me know what Extension[s] are the culprits...