Crashing when opening child character

I’m have a Master character actor with multiple child actors (archer, civilian, priest, soldier) when I open the civilian character, the editor crashes, but if i open any other character before, and then open the civilian character the blueprint loads fine.
The civilian character has just a few variables and 2 very simple functions, that’s the only difference with it’s parent
I’ve been using this workaround to continue development but today the project was crashing when opening any character so I had to go back to a previous build.
I can’t figure out what could be causing the problem, the blueprints compile with no issues

Here is the crash log Dropbox - UE4CC-Windows-7E0791524D1262AC4B7843AB937C1CCC_0000.zip - Simplify your life

EDIT: Setting up the behavior tree and blackboard inside the master character instead of the ai controller causes it to crash (works fine until i restart the project and try to open the master character)