Crash on detaching listers

Help & Support
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  1. Open two listers.
  2. Set titles using Set LISTERTITLE "{dlgstring}" (e.g. "1" and "2").
  3. Drag&drop one window onto another to merge into one dual-lister window.
  4. Split by dragging the right lister out of the window (drag&drop its border).

DOpus crashes.

My config for border:
image

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