diff --git a/superset/utils/async_query_manager.py b/superset/utils/async_query_manager.py
index 0fe45a49f..2c2e843c6 100644
--- a/superset/utils/async_query_manager.py
+++ b/superset/utils/async_query_manager.py
@@ -77,7 +77,7 @@ class AsyncQueryManager:
         self._stream_prefix: str = ""
         self._stream_limit: Optional[int]
         self._stream_limit_firehose: Optional[int]
-        self._jwt_cookie_name: str
+        self._jwt_cookie_name: str = ""
         self._jwt_cookie_secure: bool = False
         self._jwt_cookie_domain: Optional[str]
         self._jwt_secret: str