1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/appservice.py b/synapse/storage/databases/main/appservice.py
index 0694446558..abea4383c7 100644
--- a/synapse/storage/databases/main/appservice.py
+++ b/synapse/storage/databases/main/appservice.py
@@ -446,7 +446,8 @@ class ApplicationServiceTransactionWorkerStore(
             )
             last_stream_id = txn.fetchone()
             if last_stream_id is None or last_stream_id[0] is None:  # no row exists
-                return 0
+                # Stream tokens always start from 1, to avoid foot guns around `0` being falsey.
+                return 1
             else:
                 return int(last_stream_id[0])