Bukkit

Hi, i need to load all chest from my map (lot of chests)
So i use command /cr regenchest all 10.

In chat i can see "Scanning <world>"
After that few green message in chat with "Chest found X =, Y=, Z=" but after that i got message "An internal error etc. etc." and in server.log i have this huge error:

http://pastebin.com/MeH9g0xs

Can you tell me how to fix this? Without all chest loaded i cant finish this server :P
I am using 1.7.2 bukkit

note: I tried 2x times, and i went to the position whitch was in the error, and in both of times it was chest in the dungeon (near to the monster spawner)

@Kjupicka: Go

I am still unable to recreate this issue while testing. So, unfortunately, until I can consistently recreate it, there is no way I can fix it. Please let me know if you're able to recreate the issue on new map.