ClientScene TextField crashes when trying to start game a second time

[jffzhou]

To reproduce this issue:

• Create a lobby with two players
• In the host, start the game, but then immediately close the window/app before the game can start. The client should be sent back to the menu
• Start a new instance, make it the host of a new lobby, and have the old client join the new lobby
• Start the new game, and the client app should crash