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-rw-r--r--synapse/federation/sender/per_destination_queue.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/federation/sender/per_destination_queue.py b/synapse/federation/sender/per_destination_queue.py
index af85fe0a1e..89df9a619b 100644
--- a/synapse/federation/sender/per_destination_queue.py
+++ b/synapse/federation/sender/per_destination_queue.py
@@ -480,6 +480,8 @@ class PerDestinationQueue:
                     # the other sending servers are up).
                     if new_pdus:
                         room_catchup_pdus = new_pdus
+                    else:
+                        room_catchup_pdus = [pdu]
 
                 logger.info(
                     "Catching up rooms to %s: %r", self._destination, pdu.room_id