Windows .exe Error while going down stairs

[deadmarine]

FTB Launcher version (if this isn't the newest update update and try again):​

Ftb launcher v1.06 (exe version)​

Minecraft Version:​

1.4.2​

Java version:​

Version 7 Update 9​

Detailed description of the issue / how can the issue be recreated:​

Unsure​

Error logs:​

http://pastebin.com/qv5MqPcC​

 

[Ashzification]

Screenshot?

 

[deadmarine]

unfortunately no. i just was walking down steps to my mining area and it crashed. hasn't crashed since