diff --git a/api/1.2/libs/services.php b/api/1.2/libs/services.php
index 7358a78..fe9e93f 100644
--- a/api/1.2/libs/services.php
+++ b/api/1.2/libs/services.php
@@ -296,7 +296,11 @@ function get_related($url) {
 
 
     function get_preferred_domain_url($url) {
-        $urlobj = $this->load(preferred_domain_url($url['url']));
+        try {
+            $urlobj = $this->load(preferred_domain_url($url['url']));
+        } catch (UrlLookupError)
+            return null;
+        }
 
         return $urlobj;
     }