For me it seemed to be rare items with sockets would produce this. Didn't test further than like 20 seconds of clicking in a bag full of farmed up junk though...
People have been using that item code to generate fake item links, and links with more sockets than the item type can have were causing client crashes. Blizzard said they fixed that in the most recent patch, but I guess they introduced a new bug.
Rollback Post to RevisionRollBack
...and if you disagree with me, you're probably <insert random ad hominem attack here>.
Anyone ever see this when you try to link an item in game