Workshop item null prices (crashes game)

I was having trouble where my game would crash when trying to sell an item on the global market. lukiprO on discord told me it's related to workshop items being bugged with a null vendor sale price. I confirmed that the items do indeed have a null value for their sale price. He gave me the work around of:

"Solution: split the stack in 2 halves, then split a non-bugged stack in 2 halves and pull the non-bugged on the bugged. -> very important: the bugged ones have to be in a different warehouse than the non-bugged ones."

This works. However, the items I'm creating in my workshops right now have a vendor price of null still.

 

I've noticed that this happens only with certain items in my production. Diamonds, fox furs, silk cloth, philosopher stones, and maybe a few others? I just tried restarting the production in those workshops to see if it changes it.