Blank page after login.

edited May 2017 in Opencart
Hello. I've been using your services for about a week. 2 days ago the social login broke in a weird way, that produces no logs, therefore it's hard to narrow down the roots of the issue. So basically, when a user logs with facebook, he gets redirected to your api, everything goes smoothly. But when he gets redirected back to me, he only gets a blank page. Any suggestions?
EDIT: I've narrowed down the problem to Facebook, as it's working correctly with Google.

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