When you exit a single player world, clicking the "friends" multiplayer tab, shows you the single player world that you disconnected from. Clicking the result will give you "Server is full". This result shouldn't display to the host, only clients and should only be seen when the server is active.

Steps to reproduce

• Open a single player world any world.
• Leave the world.
• Click play on title screen.
• Click the "Friends" tab
• Notice that the world you just left is displayed to you in this tab. Strange.
• and clicking the result will give you "Server is full"