Edit socialconnnect/class/SCClass.md.
Find the following line : (inside "public function login($provider) " function)
if($valid_provider) {
return $this->_login($user_provider, $provider);
} else {
osc_add_flash_error_message(__('Social provider not allowed', 'socialconnect'));
return false;
}
Add the following line
osc_remove_hook('pre_user_post', 'vrisko_validate_register');
if($valid_provider) {
osc_remove_hook('pre_user_post', 'vrisko_validate_register'); // <-- add this line
return $this->_login($user_provider, $provider);
} else {
osc_add_flash_error_message(__('Social provider not allowed', 'socialconnect'));
return false;
}