You will want to add a check to the server (the server because if a player has a client without a fix, then you can have a bit of trouble). Just check if the value is negative, if it is, then multiple it by -1.
Private Sub HandleAddAuction
Call AddAuction(Index, InvItem, 1, Price)
If Price < 0 Then Price = Price * -1
(Made a quick change, I used > by mistake, it should be < )
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