[0.17.4] Crash when canceling mining productivity

[jab416171]

I just had a crash when canceling an item from the research queue. Load up the save (temp.zip), and cancel the first item in the queue (mining productivity) and it crashes.

Also (maybe unrelated): if I queue up mining productivity, I have two Mining Productivity 6's in the queue.

[Pentasim]

Same issue as in 66172