diff --git a/src/roster.py b/src/roster.py
index 957ed51a..5d21d829 100644
--- a/src/roster.py
+++ b/src/roster.py
@@ -242,7 +242,7 @@ class RosterGroup(object):
                 return 5
             return PRESENCE_PRIORITY[show]
         contact_list = self.contacts if not contact_filter\
-            else (contact for contact in self.contacts if contact_filter[0](contact, contact_filter[1]))
+            else [contact for contact in self.contacts.copy() if contact_filter[0](contact, contact_filter[1])]
         return sorted(contact_list, key=compare_contact, reverse=True)
 
     def toggle_folded(self):
@@ -250,7 +250,7 @@ class RosterGroup(object):
 
     def get_nb_connected_contacts(self):
         l = 0
-        for contact in self.contacts:
+        for contact in self.contacts.copy():
             if contact.resources:
                 l += 1
         return l
diff --git a/src/windows.py b/src/windows.py
index b0780cf5..c929de9d 100644
--- a/src/windows.py
+++ b/src/windows.py
@@ -1543,7 +1543,7 @@ class RosterWin(Win):
             self.draw_roster_information(roster)
             y = 1
             show_offline = config.get('roster_show_offline', 'false') == 'true'
-            for group in roster.get_groups():
+            for group in roster.get_groups()[:]:
                 contacts_filtered = group.get_contacts(roster.contact_filter)
                 if (not show_offline and group.get_nb_connected_contacts() == 0) or not contacts_filtered:
                     continue    # Ignore empty groups
@@ -1555,7 +1555,7 @@ class RosterWin(Win):
                 y += 1
                 if group.folded:
                     continue
-                for contact in group.get_contacts(roster.contact_filter):
+                for contact in group.get_contacts(roster.contact_filter)[:]:
                     if not show_offline and len(contact) == 0:
                         continue
                     if y-1 == self.pos: