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-rw-r--r--synapse/push/mailer.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/push/mailer.py b/synapse/push/mailer.py
index d8a0c35c79..3ae92d1574 100644
--- a/synapse/push/mailer.py
+++ b/synapse/push/mailer.py
@@ -259,7 +259,9 @@ class Mailer(object):
 
         sender_state_event = room_state[("m.room.member", event.sender)]
         sender_name = name_from_member_event(sender_state_event)
-        sender_avatar_url = sender_state_event.content["avatar_url"]
+        sender_avatar_url = None
+        if "avatar_url" in sender_state_event.content:
+            sender_avatar_url = sender_state_event.content["avatar_url"]
 
         # 'hash' for deterministically picking default images: use
         # sender_hash % the number of default images to choose from