Just as the title suggests, it crashes the game to desktop without any errors. I don't think it's game breaking but felt that I should post. To replicate; if you open your equipment menu > drag the equipped ring (while it's equipped) over to the new different one in inventory > game crashes. If you get a better ring after having equipped a worse one, to not crash you need to drop the equipped ring and then put on the new one but if you try to do it like the way it's listed above, it causes a crash.
I was just about to post a bug report on this xD Any equip you try to swap from your equipped items onto the same type of item in your inventory will crash the client.
