diff --git a/backend_api_python/app/services/signal_notifier.py b/backend_api_python/app/services/signal_notifier.py
index 8f41753..22a0e7b 100644
--- a/backend_api_python/app/services/signal_notifier.py
+++ b/backend_api_python/app/services/signal_notifier.py
@@ -231,6 +231,7 @@ class SignalNotifier:
                 else:
                     ok, err = False, f"unsupported_channel:{c}"
             except Exception as e:
+                logger.error(rf'signal notify error: {traceback.format_exc()}')
                 ok, err = False, str(e)
 
             results[c] = {"ok": bool(ok), "error": (err or "")}