ISNA problem

Hi there

wondering if I can get some assistance with this formula.

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I wish to add the ISNA so I don't get the #N/A responses.
I would prefer a blank cell as an outcome, but if not then a 0 outcome would suffice.

thanks in anticipation.
Christopher

With Excel 2007, you can use IFERROR()

e.g.

=IFERROR(VLOOKUP(A2,WDReport!A:M,13,0),"")