diff --git a/uuid.entity.inc b/uuid.entity.inc
index 4fa037f..c88933e 100644
--- a/uuid.entity.inc
+++ b/uuid.entity.inc
@@ -564,31 +564,37 @@ function entity_property_uuid_to_id(&$objects, $entity_type, $properties) {
   }
   $uuids = array();
   $values = array();
-  $i = 0;
-  foreach ($things as &$object) {
+  foreach ($things as $k => &$object) {
     foreach ($properties as $property) {
       // This is probably an entity object.
       if (is_object($object) && isset($object->{$property})) {
-        $values[$i] = &$object->{$property};
+        $values[$k] = &$object->{$property};
       }
       // This is probably a field items array.
       elseif (is_array($object) && isset($object[$property])) {
-        $values[$i] = &$object[$property];
+        $values[$k] = &$object[$property];
       }
       else {
-        $i++;
         continue;
       }
-      if (uuid_is_valid($values[$i])) {
-        $uuids[] = $values[$i];
+      if (uuid_is_valid($values[$k])) {
+        $uuids[$k] = $values[$k];
       }
-      $i++;
     }
   }
   $ids = entity_get_id_by_uuid($entity_type, $uuids);
-  foreach ($values as $i => $value) {
-    if (isset($ids[$value])) {
-      $values[$i] = $ids[$value];
+  foreach ($values as $k => $uuid) {
+    if (isset($ids[$uuid])) {
+      $values[$k] = $ids[$uuid];
+    }
+    // The UUID lookup failed, remove the item.
+    elseif (isset($uuids[$k])) {
+      if (is_array($objects)) {
+        unset($objects[$k]);
+      }
+      else {
+        $objects = NULL;
+      }
     }
   }
 }