My Mac App Store is crash when i login or logout my apple id

Dear Apple,

I don't know what happening with my MBP Retina. I'm using Mac Mountain Lion and when i login or log out my apple id in Mac Apple Store. It alway crash try to logout computer and login again nothing better. Try to shutdown and turn on again or restart nothing better. I alway get crash when try to login or logout my apple id. Please investigate and help me fix this bug i'm afrad this bug will damage my computer's memory if it happened many times.

Thanks and regards,

Tuan Do