# Can't change a BB/BT boolean from a pawn BP

**URL:** <https://forums.unrealengine.com/t/cant-change-a-bb-bt-boolean-from-a-pawn-bp/436842>\
**Category:** AI\
**Tags:** behavior-tree-task, ai-controller, unreal-engine, UE4, Blueprint, question\
**Created:** [November 1, 2018, 4:37pm UTC](https://forums.unrealengine.com/t/cant-change-a-bb-bt-boolean-from-a-pawn-bp/436842 "2018-11-01T16:37:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![anonymous\_user\_c60c64a5](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_c60c64a5](https://forums.unrealengine.com/u/anonymous_user_c60c64a5)\
**Post date:** [November 1, 2018, 4:37pm UTC](https://forums.unrealengine.com/t/cant-change-a-bb-bt-boolean-from-a-pawn-bp/436842/1 "2018-11-01T16:37:28Z")

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![258268-ai-bt.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/2/b/32b4128e95259633e930f6f87b26d5437eebdd5c.jpeg)

 ![258269-ai-controller-bp.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/e/f/4ef6bb1f49ca457ffeced99ad1c5a49e541004c2.jpeg)

 ![258270-dag-bp.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/8/1/4817f9f08d0484ec1c103143e3b23dd5ae86f7e8.jpeg)

I’m trying to swap from a simple roam AI to a follow player character AI on end overlap. Basically trying to build a train, so to speak, of pawns following behind the player character. I have the mounting and possessing by the player controller working, but when I mount a different npc the logic returns to the roam instead of the follow.

I’ve trouble shot everything and I basically I’m sure I’m not correctly passing the boolean change from the pawn, to the controller, to the blackboard. Even event tick doesn’t seem to work and I thought, at least for testing purposes, that it would.

Any help would be greatly appreciated!