From 65e69dec8b202e3f03063b18ebde55ceee69e2e7 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Mon, 6 Jul 2015 09:31:40 +0100
Subject: [PATCH] Don't explode if we don't recognize one of the event_ids in
 the backfill request

---
 synapse/storage/event_federation.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index ace7459538..c71019d93b 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -408,10 +408,12 @@ class EventFederationStore(SQLBaseStore):
                 keyvalues={
                     "event_id": event_id,
                 },
-                retcol="depth"
+                retcol="depth",
+                allow_none=True,
             )
 
-            queue.put((-depth, event_id))
+            if depth:
+                queue.put((-depth, event_id))
 
         while not queue.empty() and len(event_results) < limit:
             try: