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--- a/Allura/allura/ext/admin/admin_main.py
+++ b/Allura/allura/ext/admin/admin_main.py
@@ -510,9 +510,15 @@
         permissions = self._index_permissions()
         for args in card:
             perm = args['id']
-            permissions[perm] = []
             new_group_ids = args.get('new', [])
             group_ids = args.get('value', [])
+            # make sure the admin group has the admin permission
+            if perm == 'admin':
+                admin_group_id = str(M.ProjectRole.query.get(project_id=c.project._id, name='Admin')._id)
+                if admin_group_id not in group_ids:
+                    flash('You cannot remove the admin group from the admin permission.','warning')
+                    group_ids.append(admin_group_id)
+            permissions[perm] = []
             if isinstance(new_group_ids, basestring):
                 new_group_ids = [ new_group_ids ]
             if isinstance(group_ids, basestring):