I was experimenting a bit with the new commands, but when i began a tellraw message with two or more forward slashes, the game crashed.

What I expected to happen was...:
When i typed it in, i should have gotten an error message, or the two slashes should have been sent as a message to the other player.

What actually happened was...:
The game crashed.

Steps to Reproduce:
1. Open a world on 1.7.4 (Crashes on both singleplayer and multiplayer).
2. Type "/tellraw player //" in a command block or in the chat window.
3. Push enter. / Power the command block.
4. Notice that the game crashes.