Having creative inventory window open on a client when the server is (gracefully) stopped, causes a crash on the client. It does not happen with the survival inventory window.

What I expected to happen was..:
The "Disconnected by Server: Server Closed" message appears on the dirt background

What actually happened was...:
Client crash (see attached)

Steps to reproduce:
Start the server.
Login and switch to creative mode.
Open the creative inventory window and leave it open.
Stop the server.
Client crashes.