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-rw-r--r--synapse/util/presentable_names.py5
-rw-r--r--synapse/util/retryutils.py2
2 files changed, 5 insertions, 2 deletions
diff --git a/synapse/util/presentable_names.py b/synapse/util/presentable_names.py
index 4c54812e6f..f68676e9e7 100644
--- a/synapse/util/presentable_names.py
+++ b/synapse/util/presentable_names.py
@@ -83,7 +83,10 @@ def calculate_room_name(room_state, user_id, fallback_to_members=True,
     ):
         if ("m.room.member", my_member_event.sender) in room_state:
             inviter_member_event = room_state[("m.room.member", my_member_event.sender)]
-            return "Invite from %s" % (name_from_member_event(inviter_member_event),)
+            if fallback_to_single_member:
+                return "Invite from %s" % (name_from_member_event(inviter_member_event),)
+            else:
+                return None
         else:
             return "Room Invite"
 
diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py
index 43cf11f3f6..49527f4d21 100644
--- a/synapse/util/retryutils.py
+++ b/synapse/util/retryutils.py
@@ -128,7 +128,7 @@ class RetryDestinationLimiter(object):
             )
 
         valid_err_code = False
-        if exc_type is CodeMessageException:
+        if exc_type is not None and issubclass(exc_type, CodeMessageException):
             valid_err_code = 0 <= exc_val.code < 500
 
         if exc_type is None or valid_err_code: