[BUG] Having Deep Spider active pet on logout

Consistently, with a Deep Spider (from the tunnel system near Therazane's Throne in Deepholm) as the active pet, if the user logs out of the game, the game crashes. This appears to be caused because the deep spider cannot be rendered on the character selection screen. The detailed crash log as well as our attempts to determine the cause of the crash is available here: http://forums.worldofwarcraft.com/thread.html?topicId=26725675414&sid=2000

Steps to Reproduce:
1. Go to Deepholm.
2. Proceed into the tunnel system (with all the worms) near Therazane's Throne.
3. Tame a Deep Spider.
4. Log out of the game.
5. Notice that the game crashes.

Note: At this point, the only way to log back in using this character is with the following steps:
1. Have any other character selected on the character selection screen.
2. Hold down the Left Mouse Button on the affected hunter.
3. Let go of the LMB and immediately press the Enter key.
4. If timed right, the hunter will be logged in since the Enter key was pressed before the character was rendered on the character selection screen.