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-rw-r--r--synapse/replication/http/federation.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/replication/http/federation.py b/synapse/replication/http/federation.py
index c287c4e269..ca065e819e 100644
--- a/synapse/replication/http/federation.py
+++ b/synapse/replication/http/federation.py
@@ -78,7 +78,9 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
         """
         event_payloads = []
         for event, context in event_and_contexts:
-            serialized_context = yield context.serialize(event, store)
+            serialized_context = yield defer.ensureDeferred(
+                context.serialize(event, store)
+            )
 
             event_payloads.append(
                 {