Calling the same collision twice at the same time

In my game, I’m shooting at monsters that are placed on various structures. When the monster is destroyed by a direct hit or the structures colliding with it, it calls the onMonsterPostPostCollsion function. However, if one monster collides into another monster, the simulator or device crashes.

local onMonsterPostCollision = function( self, event )  
 --I NEED TO MAKE IT NOT CRASH THE GAME IF 2 MONSTERS COLLIDE  
 if event.force \> 1 and self.isHit == false or self.isHit == false and self.x \>= 970 or self.isHit == false and self.x \< 0 then  
 audio.play( monsterPoofSound, { channel=5, onComplete=audio.stop( 5 ) } )  
  
 self.isHit = true  
 self.isVisible = false  
 self.isBodyActive = false  
  
 if poofTween then transition.cancel( poofTween ); end  
  
 greenPoof.x = self.x; greenPoof.y = self.y  
 greenPoof.alpha = 0  
 greenPoof.isVisible = true  
  
 local fadePoof = function()  
 transition.to( greenPoof, { time=500, alpha=0 } )   
 end  
 poofTween = transition.to( greenPoof, { time=50, alpha=1.0, onComplete=fadePoof } )  
  
 monsterCount = monsterCount - 1  
 if monsterCount \< 0 then monsterCount = 0; end  
  
 self:removeEventListener( "postCollision", self )  
 self.parent:remove( self )  
 print("self removed")  
 self = nil  
  
 local newScore = gameScore + mCeil(5000 \* event.force)  
 setScore( newScore )  
 print( "Score: "..newScore )  
 end  
 end  

I’ve set up collision filters which seem to be fine but aren’t helping the problem. I’ve also tried to set it up as a global collision but that won’t allow the event.force comparison to work. I’ve also tried creating separate postCollision functions for the individual monsters but that didn’t work either.

I’m really lost on this on it’s the only thing besides debugging that’s preventing me from finishing the game so any help would be greatly appreciated.

Thanks in advance! [import]uid: 14032 topic_id: 9720 reply_id: 309720[/import]

This problem is all taken care of! Here’s the other thread that helped it out if anybody needs it -
https://developer.anscamobile.com/forum/2011/04/16/self-vs-self

And this here link figured out the main source of the problem -
http://jonbeebe.net/post/2515495262/corona-collision-no-no [import]uid: 14032 topic_id: 9720 reply_id: 35579[/import]