diff --git a/apps/notification/common/log/json_sink.py b/apps/notification/common/log/json_sink.py
index a798156..867ef42 100644
--- a/apps/notification/common/log/json_sink.py
+++ b/apps/notification/common/log/json_sink.py
@@ -81,5 +81,5 @@ class JsonSink:
             exc_type, exc_value, exc_tb = record["exception"]
             log_entry["stacktrace"] = traceback.format_exception(exc_type, exc_value, exc_tb)
 
-        self.log_file.write(json.dumps(log_entry, ensure_ascii=False) + "\n")
+        self.log_file.write(json.dumps(log_entry, ensure_ascii=False, default=str) + "\n")
         self.log_file.flush()