Check if comments to bugs are possible before providing a submit-form

Dear webmaster, A suggestion about your bug-tracker: Even if... "You can not add comments for bugs with the statuses:Closed, Duplicate, Wont fix, Bogus, Stale" .... you could check this before I enter my comment to a bug and release thereafter(!) that I just wasted some minutes of my live. I actually find this behaviour strange, because, what if bugs as been "closed" but they are actually still occure (like http://bugs.php.net/bug.php?id=35336&edit=1) ?

    best regards
    tom