I've got an empty blueprint pinned to the quickbar (with middle mouse), and then select a zone to duplicate, like this:
then when I click "create blueprint" to confirm this selection, and "close" the hand (with 'Q'), the game crashes with this error:
It doesn't happen when the blueprint isn't pinned to the quickbar. Happens every time I tried, on different slots in the quickbar.
[edit] hum, why not add a save