I prompt an Event sign-up in game, sometimes this error will pop up and stop the player from moving after they have closed the prompt window, or make them move on their own. The issue is with forcing PC users into selection mode and them closing it too fast. Not tested on other devices.
It is easy to reproduce and happens maybe 1/3 times.
Also is the “CloseButton” you’re referring to a button that you have created, or is it part of this prompt that we provide?
Main reason I ask is because the error message here is actually a bit ambiguous on the engine’s side “PlayerGui” really just means “PlayerGui”, or “CoreGui”.
Thanks for your report. We have released an initial fix for this by preventing default keyboard navigation for keyboard players. Now, keyboard navigation will only turn on when the navigation keys are used. We have some other further improvements to the selection navigation behaviour here coming soon to fully address this issue.