diff --git a/mobile.netbiblio.php b/mobile.netbiblio.php
index ad35934..b46ddc5 100644
--- a/mobile.netbiblio.php
+++ b/mobile.netbiblio.php
@@ -354,7 +354,7 @@ class NetBiblio extends WebService
         );
 
         foreach ($results['response']['docs'] as $doc) {
-            $data[] = $this->AddFiles($doc);
+            $data[] = $this->AddFiles((array) $doc);
         }
 
         return $data;