Index: modules/importexportapi/engines/importexportapi_db_get.inc
===================================================================
--- modules/importexportapi/engines/importexportapi_db_get.inc	(revision 231)
+++ modules/importexportapi/engines/importexportapi_db_get.inc	(working copy)
@@ -181,7 +181,7 @@
             $parent_match = TRUE;
             foreach ($query['parent_references'] as $reference_field => $reference) {
               $result_key = $def[$query['field']][$reference['field']]['#get']['#db_field'];
-              if (isset($result->$result_key) && $data[$data_index][$reference_field]['#value'] != $result->$result_key) {
+              if (isset($result->$result_key) && $data[$data_index][$reference_field]['#value'] !== $result->$result_key) {
                 $parent_match = FALSE;
                 break;
               }
@@ -409,7 +409,7 @@
       if ($query['depth'] > 1 && isset($parent_data)) {
         foreach ($query['parent_references'] as $reference_field => $reference) {
           $result_key = $parent_data['#value'][$parent_index][$reference['field']]['#get']['#db_field'];
-          if ($parent_data['#value'][$parent_index][$reference_field]['#value'] != $result->$result_key) {
+          if ($parent_data['#value'][$parent_index][$reference_field]['#value'] !== $result->$result_key) {
             $parent_match = FALSE;
             break;
           }