Strange, my suggestion is based on you misleading name and there’s nothing wrong with you code. So i also don’t know what wrong with it. But if this only binding have problem then Tick solution is fine
One thing you can do try to remove binding use Create Biding from widget, not create a new one in EventGraph then assign, then use your code. Also add one more output when Cast to ThirdPersonBP is Null. If not try to create a new widget and try in case your widget is corrupted somehow.