diff --git a/pagure/internal/__init__.py b/pagure/internal/__init__.py
index d76b7b8..5420b1d 100644
--- a/pagure/internal/__init__.py
+++ b/pagure/internal/__init__.py
@@ -293,6 +293,7 @@ def get_pull_request_ready_branch():
             main_commits = set()
             branch_commits = list()
             while 1:
+                com = None
                 if compare_branch:
                     try:
                         com = main_walker.next()