[Bug 0.51] Selling items when at negative gold increased, not reduced, debt

I had a positive gold amount, then got hit with Plague, and chose the 'spend gold to cure without losing pop' option, ending up with -67 gold.  I then sold a few items, ~60 gold worth, then saw my debt was now -127 gold.  Apparently the profit from selling was added to debt instead of subtracted.  It was handled as if I had a positive gold amount and the sale profit added to it.

I reloaded but the plague event didn't recur, so no screenshots or replication of this.  Will add to this if it does/doesn't recur should I go negative gold again.