Trapping for instance of #NA in Excel

Trapping for instance of #NA in an excel vlookup and replacing with a 0 (zero) so you can use the value in a sum formula

=IF(ISNA(VLOOKUP(A3,'Sheet1'!$A$4:$K$907,5,FALSE)),0,VLOOKUP(A3,'Sheet1'!$A$4:$K$907,5,FALSE))