Quote from azkedar on 2011/11/23, 03:04

The VS crashed earlier today at about 5:45pm GMT. duckyboy3210 was trying to "/buy 1000 stone 0.80" when he got "An internal error occurred while attempting to perform this command." After that, all the VS commands were giving that same error (for all users). He managed to do a "/find stone" just before that successfully.

Not sure if there is anything in the log or that you want to check, but I thought I'd go ahead and report the crash. Ducky says he lost the money for the transaction, but did not receive stone, due to the error.