Roles restriction not working

The role restriction always gives true.
Reproduce:
Limit quiz-maker to a specific role (say admin)
Login with a user having a different role (say editor)
De editor user still has access to Quiz Maker

Cause:
The function quiz_maker_capabilities incorrectly checks for the user’s role.

foreach($current_user_roles as $r){
    if(in_array($r, $ays_user_roles)){
        $ishmar++;
    }
}

The $ays_user_roles contains an array with the role names as Keys and value = true.
Fix:

foreach($current_user_roles as $key => $r){
    if(isset($ays_user_roles[$key])){
        $ishmar++;
    }
}