Pitivi shows 2 identical error dialogs when crashing
When making an engine crash following #2231 (closed) steps, Pitivi shows 2 identical error dialogs.
Here is a gdb stacktrace (under wayland, but same issue under X11).
18:19:18 is when the first dialog appears, 18:19:23 is when the second one appears.
18:20 and later is when using ESC key to avoid having to interact with the dialog boxes.