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-rw-r--r--synapse/storage/client_ips.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/storage/client_ips.py b/synapse/storage/client_ips.py
index 71e5ea112f..b01f0046e9 100644
--- a/synapse/storage/client_ips.py
+++ b/synapse/storage/client_ips.py
@@ -120,6 +120,9 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
                 where_clauses.append("(user_id = ? AND device_id = ?)")
                 bindings.extend((user_id, device_id))
 
+        if not where_clauses:
+            return []
+
         inner_select = (
             "SELECT MAX(last_seen) mls, user_id, device_id FROM user_ips "
             "WHERE %(where)s "