From 056327457ff471495741a539e99c840ed54afccd Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 22 Jan 2021 19:44:08 +0000
Subject: Fix chain cover update to handle events with duplicate auth events
 (#9210)

---
 synapse/util/iterutils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'synapse')

diff --git a/synapse/util/iterutils.py b/synapse/util/iterutils.py
index 6ef2b008a4..8d2411513f 100644
--- a/synapse/util/iterutils.py
+++ b/synapse/util/iterutils.py
@@ -78,7 +78,7 @@ def sorted_topologically(
         if node not in degree_map:
             continue
 
-        for edge in edges:
+        for edge in set(edges):
             if edge in degree_map:
                 degree_map[node] += 1
 
-- 
cgit 1.4.1