Cannot Convert To Decimal

I have a money field in SQL that when i try and get the sum of it i cannot convert it to decimal.  This was working now its not, and nothing was changed.

Any reason for the error? 
 
 
DECLARE @TEST decimal(10,2)
SET @Test = (SELECT SUM(INV_Net) FROM abc.dbo.iSplit_Details WHERE LoanID='0000010604')
Print @Test
RETURNS: 160471.24
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Specified cast is not valid. Description:
An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and
where it originated in the code.

Exception Details:
System.InvalidCastException: Specified cast is not valid.

Source
Error:





Line 3576: // CURRENT TOTAL
Line 3577: cmd.CommandText = "SELECT SUM(INV_Net) FROM abc.dbo.iSplit_Details WHERE LoanID=@LoanID";
Line 3578: decimal split_currentamt = ((decimal)cmd.ExecuteScalar());