naming guests after players in server and drowning them causes crash?

[carmendar]

I was playing on my server with a friend and he's new, so as a joke I showed him that you could drown guests.
He thought it was hilarious and so I named a guest as his username. as soon a the guest with his username drowned he crashed.

Is this intentional? Is this a glitch? Was it just a coincidence?

[Gymnasiast]

That was coincidence. Unless you can trigger it every time.