diff --git a/net_alerter/ble_alerter.py b/net_alerter/ble_alerter.py
index d67c689..a84d5ef 100755
--- a/net_alerter/ble_alerter.py
+++ b/net_alerter/ble_alerter.py
@@ -352,6 +352,10 @@ async def scan_loop():
         if "No Bluetooth adapters found" in str(e) or "No default Bluetooth adapter" in str(e):
             logging.warning("No Bluetooth adapter found — BLE scanning disabled.")
             shutdown_event.set()
+        elif "No discovery started" in str(e):
+            # BlueZ teardown race: SIGTERM cancelled the scanner before BleakScanner.__aexit__
+            # ran stop(). BlueZ already stopped the scan, so this is harmless.
+            logging.debug(f"BlueZ teardown race on shutdown (ignored): {e}")
         else:
             logging.error(f"Failed to initialize BLE scanner: {e}")
             raise