Solution:
Here the solution for it.
Place the below code in your function.php file.
Don’t forgot to update your domain name.
function wsl_whitelist_endpoint()
{
setcookie( LOGGED_IN_COOKIE, md5(rand()), time()+15,'http://yourdomainnamegoeshere/wp-content/plugins/wordpress-social-login/hybridauth' );
}
add_filter( 'wsl_process_login_start', 'wsl_whitelist_endpoint' );