Outlook crash error

For the past 3/4 months I have had an error with my ms outlook crashing around 15/20 times each day. Various attempts to fix by myself and Microsoft failed, i was then forced to format my pc and reinstall everything which solved the issue. A week later I added the Zoho outlook addon which immediately crashed my outlook and not the problem has returned. This means the the ad don is the problem, Do you have any knowledge of this error?