to reproduce
1. open any image in Viewer
2. copy any part of the image via Ctrl+C
3. press Ctrl+V to paste it multiple times, eg 2 copy will be pasted, but paste toolbar will appear twice
4. press Esc 2 times app will crash
expected behavior
few options
apply existing copy and paste new one in the same place
OR
use Ctrl+V combination to Apply action as there is no default shortcut (Enter opens Browser)
behavior similar to Crop toolbar when pressing Shift+X