User with phone num not able to login

User has registered and entered mobile phone number. Later on, he is not been able to login (exception will be thrown, see attached screenshot).


Reproducible on production CfC and also on staging environment:
http://staging.codeforcroatia.org/people/Bex

When phone number was erased from producton proiule, user has been able to login.

There is some problem when phone number is present.

Laddr version: v2

Start by reproducing the login failure at the staging profile URL, first with the phone number present and then after it is erased. Read the attached exception screenshot and trace the login path to identify where phone-number data causes the error. Done means the affected user can log in while retaining a phone number.

Written by the indexing model from the issue text.