Uninstall the program that is crashing and then go to the registry locations shown below and remove the keys, then reinstall the add-in that was crashing.
HKEY_CURRENT_USERSoftwareMicrosoft Office 15.0Outlook Resiliency
HKEY_CURRENT_USERSoftwareMicrosoft OfficeOutlookAddins
– remove the keys that refer to your troubled Outlook add-in