diff --git a/sites/all/modules/feeds_xpathparser/FeedsXPathParserBase.inc b/sites/all/modules/feeds_xpathparser/FeedsXPathParserBase.inc
index 8c53d79..e65997b 100644
--- a/sites/all/modules/feeds_xpathparser/FeedsXPathParserBase.inc
+++ b/sites/all/modules/feeds_xpathparser/FeedsXPathParserBase.inc
@@ -169,7 +169,7 @@ abstract class FeedsXPathParserBase extends FeedsParser {
     foreach ($mappings_ as $mapping) {
       if (strpos($mapping['source'], 'xpathparser:') === 0) {
         $mappings[$mapping['source']] = $mapping['target'];
-        if ($mapping['unique']) {
+        if (isset($mapping['unique']) && $mapping['unique']) {
           $uniques[] = $mapping['target'];
         }
       }