[trevius]

You don't want to stop a timer from within EVENT_TIMER unless you are stopping one timer from another timer. The simple way is to just use EVENT_COMBAT like so:

sub EVENT_COMBAT {

  if ($combat_state == 0) {
    quest::stoptimer("BossAE");
    quest::stoptimer("BossResAE");
    quest::stoptimer("BossProc");
    quest::stoptimer("RandomNuke");
    quest::depopall(899007);
  }

}

We use this all of the time for resetting events/encounters if a raid wipes.