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-rw-r--r--synapse/storage/databases/main/deviceinbox.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/deviceinbox.py b/synapse/storage/databases/main/deviceinbox.py
index d03b5e5a7d..25e9c1efe1 100644
--- a/synapse/storage/databases/main/deviceinbox.py
+++ b/synapse/storage/databases/main/deviceinbox.py
@@ -489,10 +489,12 @@ class DeviceInboxWorkerStore(SQLBaseStore):
             devices = list(messages_by_device.keys())
             if len(devices) == 1 and devices[0] == "*":
                 # Handle wildcard device_ids.
+                # We exclude hidden devices (such as cross-signing keys) here as they are
+                # not expected to receive to-device messages.
                 devices = self.db_pool.simple_select_onecol_txn(
                     txn,
                     table="devices",
-                    keyvalues={"user_id": user_id},
+                    keyvalues={"user_id": user_id, "hidden": False},
                     retcol="device_id",
                 )
 
@@ -505,10 +507,12 @@ class DeviceInboxWorkerStore(SQLBaseStore):
                 if not devices:
                     continue
 
+                # We exclude hidden devices (such as cross-signing keys) here as they are
+                # not expected to receive to-device messages.
                 rows = self.db_pool.simple_select_many_txn(
                     txn,
                     table="devices",
-                    keyvalues={"user_id": user_id},
+                    keyvalues={"user_id": user_id, "hidden": False},
                     column="device_id",
                     iterable=devices,
                     retcols=("device_id",),