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-rw-r--r--synapse/crypto/keyring.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py
index 1f24e58ba0..a061def16a 100644
--- a/synapse/crypto/keyring.py
+++ b/synapse/crypto/keyring.py
@@ -329,7 +329,7 @@ class Keyring(object):
                 verify_key.time_added = time_now_ms
                 old_verify_keys[key_id] = verify_key
 
-        for key_id in response_json["signatures"][server_name]:
+        for key_id in response_json["signatures"].get(server_name, {}):
             if key_id not in response_json["verify_keys"]:
                 raise ValueError(
                     "Key response must include verification keys for all"