Calling this.destroy() in an event listener can cause an exception while processing other events of the same type

[vincentjames501]

The code below shows the problem

      if(this.listeners && this.listeners[event]) {
        // Call each listener in the context of either the target passed into
        // `on` or the object itself.
        for(var i=0,len = this.listeners[event].length;i<len;i++) {
          var listener = this.listeners[event][i];
          listener[1].call(listener[0],data); // If this listener calls destroy on itself, the list we're looping through can change and listener can be undefined
        }
      }

It would be better to build an Array of the functions you want to call, then execute them all so the list is immutable during iteration.

[cykod]

It would be better - but building one-use arrays on every step is terrible for GC, which is the primary performance issue Quintus has, so it's a no go.

If you're running into a problem - call stage.remove(sprite) which will put off the call to destroy until after the step