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I get the following warning when I save the user profile edit form without making any form changes to comment notify settings. (Such as enabling notifications or switching from all comments to only replies). If I make changes to comment notify form settings then the error does not appear upon saving the form.
user warning: Duplicate entry '3' for key 'PRIMARY' query: INSERT INTO comment_notify_user_settings (uid, node_notify, comment_notify) VALUES (3, 1, 1) in C:\websites\dev_site\sites\all\modules\comment_notify\comment_notify.module on line 328.