I just received an Unexpected Error. The error is Null in Variable Name

[bertabcd1234]

See if any of this advice applies to your situation:

Hub Variables option, on Settings menu, not working (error message)

This might help: If you don't have any connectors, removing the app is harmless; if you do, they'll break and need to be re-created unless Bruce is able to personally assist in that manner again. If you know what caused the app to end up in this state, that might also be helpful for them to see if there is a way to prevent it in the future.