So i just want a score and thats my script. On world CrabWorldSlither the score works fine, but in crabworld it says NullpointerException. I dont know why and there are no errors in the script so... My script: if(getWorld() instanceof CrabWorldSlither){if(isTouching(Craby.class)){this.setLocation(Greenfoot.getRandomNumber(500), Greenfoot.getRandomNumber(500)); op++; }} if (getWorld() instanceof CrabWorld){if(isTouching(Craby.class)){op++; getWorld().removeObject(this); }} getWorld().showText("Score:"+op, 400,60);