Drag outside App = Crash

In my windows-App i’m using the DragOver Event in a Canvas.
This works fine, but when i move the mouse outside the App-Window, it crashes. Am i doing wrong?

Isn’t DragExit to be used in that case ?

From LR:

Fires when the DragItem exits the Window.

You should report that in Feedback. Make sure to attach a project that demonstrates the bug.