Changing duration for a transition rule in blend settings in the animation blueprints anim graph

(Im trying to post a picture but apparently thats impossible from a phone)
When im in the animation blueprint for my character, and im in the Anim graph, and i click on one of the transition rules, in the details panel there is a section that says blend settings, and in there, there’s a variable called duration which can be adjusted for the amount of time it blends the animations together when it is transitioning. Every time we try to adjust that duration variable, Unreal crashes. Is this just a bug with the engine, or is there a reason this is crashing the game that i can fix?