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StringVar Error: start position is less than 1 or not an integer

IO_Dork asked
Last Modified: 2014-08-06
I have a formula field called "Billing" that uses Local StringVar.  When I run the report I get the error:
"Start position is less than 1 or not an integer" and then it kicks me into the formula to debug it.  

How do I fix the formula field to deal with this?

Formula field {@Billing}:

Local StringVar strBill;

strBill := Mid({@Admin Comments},InStrRev({@Admin Comments},"$bill"));
If Length(strBill) > 20 then
    strBill := "*****" & strBill;

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