The most common cause is that a user has been deleted from the system (or removed from their Security Profile), causing any Workflow Form records they created, approved or otherwise had involvement with to become corrupt. Resolve this by recreating the user and placing them in a Security Profile again — all their records will then return to normal. If the user left the company, see the article 'Delete a user who has left the company'. If you are unsure which users have been deleted or do not believe any have been deleted, contact support.
