Index: channels/_generic.py
==================================================================
--- channels/_generic.py
+++ channels/_generic.py
@@ -235,11 +235,11 @@
         # finds differences in new/old streamlist, marks deleted with flag
         def deleted_streams(self, new, old):
             diff = []
             new = [row.get("url","http://example.com/") for row in new]
             for row in old:
-                if (url in row and (row.get("url") not in new)):
+                if ("url" in row and (row.get("url") not in new)):
                     row["deleted"] = 1
                     diff.append(row)
             return diff