Is it possible for a block to disable another block?

[djha...@gmail.com]

I am creating a maze game where whenever you touch a wall, you lose. When you touch the goal, you win. The problem is, if the CharacterSprite hits the GoalSprite, the game pops up with win and lose. Is there any fix for this, or should I find a way for the "when GoalSprie.CollidedWith to disable the CharacterSprite.CollidedWith?