diff --git a/mappers/file.inc b/mappers/file.inc
index a3125f2..1086c50 100644
--- a/mappers/file.inc
+++ b/mappers/file.inc
@@ -91,6 +91,14 @@ function file_feeds_set_target($source, $entity, $target, $value) {
       $i++;
     }
   }
-
+  // If some files were not downloaded: ignore them to not provoke SQL error.
+  foreach ($field['und'] as $delta => $value) {
+    if (empty($value['fid'])) {
+      unset($field['und'][$delta]);
+    }
+  }
+  if (empty($field['und'])) {
+    $field = array();
+  }
   $entity->{$target} = $field;
 }