Using "say" command in SP closes game

Using the “say” command in Single Player closes the game immediately. Not even sure if that’s really a “crash” or not.
You may wonder why I want to say something in SP? I keep the command “say ^_^” bound to mouse3 for multiplayer and I pressed it accidentally. I didn’t test if this happens in Windows too.

Update: this happens for me on Windows and Linux.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.