HTTP Error 500 with Facebook register

HI,
I am facing this issue with Facebook Register , When i try to register it redirected back to my website easily , And asking to fill Telephone Number, when i fill telephone number and press submit button , it is says

The "your website Name" page isn’t working

"Your website name "is currently unable to handle this request.
HTTP ERROR 500

But when check to Admin panel, that user is already successfully registered with that mobile Number and still that user can Login again and again.

Please let me know the solution for this.

Thank,s

Answers

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