You'd get the help you needed but you didn't search, instead, you came, and asked before you reasearched. This has been answered before. You are using MDH for TBC databases. it isn't supported. There have been work arounds but they take ALOT of time. Basically you have to search all of your tables and get rid of the NULL values. As an added shot, this isn't a MaNGOS error, and if you would have read the MDH website you would have known WHICH SDB versions your revision was good for.