Alt clicking may crash your game

[Niko432]

Reporting client version: 515.1647

Twice this week i got an error stating "encountered an improper argument", this error made me disconnect from the game and I needed to either reconnect or wait until it does so automatically.

Both times it happened while I was alt clicking:

Once while alt clicking a syringe gun

And also twice while alt clicking a monkey trying to figure out how to remove it from a noose. And this time it seemed like the error was very consistent, happening every single time I tried alt clicking it

[JReese3]

I can confirm, I crash if I alt click near any monkey mob. Or if changeling in monkey form. Which is a pain in the ass because I took monkey form just for vent crawl, and was a crash every time I started a vent crawl.