Custom login script throws 500

[senabean33]

Hi our site uses a custom login function to assure that our members have signed a waiver, SSO works great from the main blon but when I call it from one of the subsites it throws a error my guess is because SSO is fired after wp_signon because even though it throws the error. closing the modal & refreshing the page shows that I am signed in. Any ideas on how I can fix this?

switch_to_blog(1);
$user = wp_signon( array( 'user_login' => $username, 'user_password' => $data['password'], 'remember' => $remember ), true );
restore_current_blog();

if ( is_wp_error( $user ) ) {
    $response['message'] = $user->get_error_message();
    wp_send_json( $response );
}
else {
    $response['success'] = true;....

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if you would like to see the problem in action let me know & I'll get you a login and URLS