AI doesn't stop moving towards player

I’m trying to create an AI based off the [Behavior tree Quick Start Guide][1], but I haven’t been able to make the AI stop walking towards the player.

This is how the CloseEnough decorator looks now, and I figure that when the ReturnNode returns false, the subsequent commands should stop executing. However, the AI just ignores it and keeps walking until it is right next to the player.

Could someone help me out with this?