the STOP block

Hi all, just a quick question.  In 'When Updating' I have an IF block which constantly checks if 'something' is 'something' during a level, when something IS something it creates an actor, however it keeps checking and creates lots of the same actor.  When and where would I use a 'stop' block to cancel the check, or do I use a 'cancel' block?   thanks for any advice!

Perhaps you should use a boolean to keep track of whether you've already created the object, so that you only create the object if your original expression is true, and the object hasn't been created yet.