Index: Open-ILS/src/perlmods/OpenILS/Utils/ModsParser.pm
===================================================================
--- Open-ILS/src/perlmods/OpenILS/Utils/ModsParser.pm	(revision 19114)
+++ Open-ILS/src/perlmods/OpenILS/Utils/ModsParser.pm	(working copy)
@@ -16,7 +16,7 @@
 
 # ----------------------------------------------------------------------------------------
 # XPATH for extracting info from a MODS doc
-my $isbn_xpath			= "//mods:mods/mods:identifier[\@type='isbn']";
+my $isbn_xpath			= "//mods:mods/mods:identifier[\@type='isbn' and not(\@invalid)]";
 my $resource_xpath	= "//mods:mods/mods:typeOfResource";
 my $pub_xpath			= "//mods:mods/mods:originInfo//mods:dateIssued[\@encoding='marc']|" . 
 								"//mods:mods/mods:originInfo//mods:dateIssued[1]";