Server crasht ab und an (Log: dead entity is not an object)

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bomb_think()
{
	self endon("bomb_exploded");
	level.barincrement = (level.barsize / (20.0 * level.defusetime));

	for(;;)
	{
		self waittill("trigger", other);
		
		// check for having been triggered by a valid player
		if(isPlayer(other) && (other.pers["team"] == game["defenders"]) && other isOnGround())
		{
			if(!isDefined(other.defuseicon))
			{
				other.defuseicon = newClientHudElem(other);				
				other.defuseicon.alignX = "center";
				other.defuseicon.alignY = "middle";
				other.defuseicon.x = 320;
				other.defuseicon.y = 345;
				other.defuseicon setShader("ui_mp/assets/hud@defusebomb.tga", 64, 64);			
			}
			
			while(other islookingat(self) && distance(other.origin, self.origin) < 64 && isAlive(other) && other useButtonPressed())
			{
				other notify("kill_check_bomb");

				if(!isDefined(other.progressbackground))
				{
					other.progressbackground = newClientHudElem(other);				
					other.progressbackground.alignX = "center";
					other.progressbackground.alignY = "middle";
					other.progressbackground.x = 320;
					other.progressbackground.y = 385;
					other.progressbackground.alpha = 0.5;
				}
				other.progressbackground setShader("black", (level.barsize + 4), 12);		

				if(!isDefined(other.progressbar))
				{
					other.progressbar = newClientHudElem(other);				
					other.progressbar.alignX = "left";
					other.progressbar.alignY = "middle";
					other.progressbar.x = (320 - (level.barsize / 2.0));
					other.progressbar.y = 385;
				}
				other.progressbar setShader("white", 0, 8);			
				other.progressbar scaleOverTime(level.defusetime, level.barsize, 8);

				other playsound("MP_bomb_defuse");
				other linkTo(self);
				other disableWeapon();

				self.progresstime = 0;
				while(isAlive(other) && other useButtonPressed() && (self.progresstime < level.defusetime))
				{
					self.progresstime += 0.05;
					wait 0.05;
				}

				if(isDefined(other.progressbackground))
					other.progressbackground destroy();
				if(isDefined(other.progressbar))
					other.progressbar destroy();

				if(self.progresstime >= level.defusetime)
				{
					if(isDefined(other.defuseicon))
						other.defuseicon destroy();

					if ( level.battlerank )
					{
						other.pers["score"] += 5;
						other.score = other.pers["score"];
					}
					
					objective_delete(0);

					self notify("bomb_defused");
					level.bombmodel setmodel("xmodel/mp_bomb1");
					level.bombmodel stopLoopSound();
					self delete();

					announcement(&"SD_EXPLOSIVESDEFUSED");
					
					lpselfnum = other getEntityNumber();
					lpselfguid = other getGuid();
					logPrint("A;" + lpselfguid + ";" + lpselfnum + ";" + game["defenders"] + ";" + other.name + ";" + "bomb_defuse" + "\n");
					
					players = getentarray("player", "classname");
					for(i = 0; i < players.size; i++)
					{
						players[i] playLocalSound("MP_announcer_bomb_defused");
					}
					level thread endRound(game["defenders"]);
					return;	//TEMP, script should stop after the wait .05
				}
				else
				{
					other unlink();
					other enableWeapon();
				}
				
				wait .05;
			}

			self.defusing = undefined;
			other thread check_bomb(self);
		}
	}
}