diff --git a/api/core/workflow/nodes/list_operator/entities.py b/api/core/workflow/nodes/list_operator/entities.py
index 6a27de40fd..75df784a92 100644
--- a/api/core/workflow/nodes/list_operator/entities.py
+++ b/api/core/workflow/nodes/list_operator/entities.py
@@ -59,4 +59,4 @@ class ListOperatorNodeData(BaseNodeData):
     filter_by: FilterBy
     order_by: OrderBy
     limit: Limit
-    extract_by: ExtractConfig
+    extract_by: ExtractConfig = Field(default_factory=ExtractConfig)