RPC error: MoveItem when moving stacked items

Hi, I get an RPC error whenever I move an item in my inventory taken from the administrator spawn menu of stack size 1000. 

From my current efforts at fixing the error, I've opened up the assembly-csharp.dll in dotPeek and have seen this is caused by "Item->SplitItem(amount)" when the amount is less than 0.

However, even without plugins on the server, this still occurs. 

How could I resolve this?

- Thanks in advance, Harry.

RPC ERROR In move item (Server Console)

This is what's in the server console when this error is triggered.

Merged post

Fixed, don't use *=  with stack sizes.