Game crashed

[observer24]

It crashed everytime i tried to play cornfield crossing, all my story mode progress is gone too, here's the log (Device = windows 7 (32-bit)) =
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SuperTuxKart crashed :/
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SuperTuxKart crashed!
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to the developers on our forum: viewforum.php?f=16

Call stack:

build
buildOptimizedBvh
createPhysicalBody
createPhysicsModel
loadTrackModel
createKartWithTeam
updateSectorForKarts
__emutls_get_address
setEventReceiver
handleServerCheckStructureCount
startNextRace
free
_M_emplace_back_aux<RaceManager::KartStatus>
free
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OK
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