This is what came up right before the crash occured:
Entering [PirateCannonPackage]armor::onTrigger(44, 13389, 2, 0)
Entering [TankPackage]armor::onTrigger(44, 13389, 2, 0)
Entering armor::onTrigger(44, 13389, 2, 0)
Leaving armor::onTrigger() - return 0
Leaving [TankPackage]armor::onTrigger() - return 0
It appears that this has to do with the default tank vehicle. Try disabling that.