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-rw-r--r--synapse/groups/groups_server.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/groups/groups_server.py b/synapse/groups/groups_server.py
index 10bf61d178..991cc12cce 100644
--- a/synapse/groups/groups_server.py
+++ b/synapse/groups/groups_server.py
@@ -109,6 +109,7 @@ class GroupsServerHandler(object):
                 room_id, len(joined_users),
                 with_alias=False, allow_private=True,
             )
+            entry = dict(entry)  # so we don't change whats cached
             entry.pop("room_id", None)
 
             room_entry["profile"] = entry