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PayPal Pro - Duplicate entry for key 'email' #1874
ran into this whilst testing today.
it tried to update the email address for your logged in customer account record to that of another customer and violates the primary key.
My thoughts would be that if the customer is unregistered, or doesn't already exist in CubeCart_customer then it gets added.
There shouldn't be any need to update/revise the CubeCart_customer email address at alll. Checking out using a PayPal email address which is different shouldn't matter. the PP email address should be captured in CubeCart_order_summary