pressing forward button when typing a comment causes a blank screen

to repropduce:

1. open the bugtracker, click tos ome other bages, and then go back to be able to press the forward button.

2. start typing a comment (don't leave it, and ensure it contains any text).

3. press forward button

4. press cancel in the notification that changes will be lost

5. ❌ see the result.

EDIT: I can't reproduce anymore, and I didn't take any screenshots.