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Why does this code produce error when Field length is 0


Why does this code produce error when Field length is 0

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awheeler_01
awheeler_01
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The code is:

=IIF(Len(Fields!Academic.Value)> 0, Left(Fields!Academic.Value,InStr(Fields!Academic.Value, "(") - 1), "")
which produces and error.
If I change the code to
=IIF(Len(Fields!Academic.Value)> 0, Fields!Academic.Value, "") there is no error. I want to display only the characters before ")" character if the field has a value otherwise nothing. Seems simple enough but ...
any ideas.
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