diff --git a/weboob/backends/aum/pages/contact_list.py b/weboob/backends/aum/pages/contact_list.py
index 3134d20a..f4c660d3 100644
--- a/weboob/backends/aum/pages/contact_list.py
+++ b/weboob/backends/aum/pages/contact_list.py
@@ -134,7 +134,11 @@ class ContactListPage(PageBase):
     def on_loaded(self):
         self.items = []
 
-        tags = self.document.getElementsByTagName('form')[0].childNodes[3].childNodes[1].childNodes
+        form = self.document.getElementsByTagName('form')
+        if not form:
+            return
+
+        tags = form[0].childNodes[3].childNodes[1].childNodes
 
         for tag in tags:
             if not hasattr(tag, 'tagName') or tag.tagName != u'tr':