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-rw-r--r--synapse/handlers/room_list.py11
1 files changed, 9 insertions, 2 deletions
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index 38e1737ec9..dc88620885 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -16,7 +16,7 @@
 import logging
 from collections import namedtuple
 
-from six import iteritems
+from six import PY3, iteritems
 from six.moves import range
 
 import msgpack
@@ -444,9 +444,16 @@ class RoomListNextBatch(namedtuple("RoomListNextBatch", (
 
     @classmethod
     def from_token(cls, token):
+        if PY3:
+            # The argument raw=False is only available on new versions of
+            # msgpack, and only really needed on Python 3. Gate it behind
+            # a PY3 check to avoid causing issues on Debian-packaged versions.
+            decoded = msgpack.loads(decode_base64(token), raw=False)
+        else:
+            decoded = msgpack.loads(decode_base64(token))
         return RoomListNextBatch(**{
             cls.REVERSE_KEY_DICT[key]: val
-            for key, val in msgpack.loads(decode_base64(token)).items()
+            for key, val in decoded.items()
         })
 
     def to_token(self):