diff --git a/frontends/src/quick_frontend/quick_contact_list.py b/frontends/src/quick_frontend/quick_contact_list.py
index 7c7e27cd..1f5a7942 100644
--- a/frontends/src/quick_frontend/quick_contact_list.py
+++ b/frontends/src/quick_frontend/quick_contact_list.py
@@ -395,7 +395,11 @@ class ProfileContactList(object):
         cache_attr = cache[C.CONTACT_RESOURCES].setdefault(entity.resource, {}) if entity.resource else cache
         for attribute, value in attributes.iteritems():
             if value is None:
-                cache_attr[attribute].pop(value, None)
+                # XXX: pyjamas hack: we need to use pop instead of del
+                try:
+                    cache_attr[attribute].pop(value)
+                except KeyError:
+                    pass
             else:
                 cache_attr[attribute] = value