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Question: Mail crashes upon launch

Suddenly, Mail crashes upon launch continually. OS Sierra;10.12.6

I get the following message:

Application Specific Information:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'

abort() called

terminating with uncaught exception of type NSException

Any help gratefully appreciated.

MacBook Pro (Retina, 15-inch, Early 2013), macOS Sierra (10.12.6)

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User profile for user: delfrompapillion

Question: Mail crashes upon launch