diff --git a/api/core/workflow/nodes/knowledge_retrieval/entities.py b/api/core/workflow/nodes/knowledge_retrieval/entities.py
index d6a5111a43..cdbce3ce14 100644
--- a/api/core/workflow/nodes/knowledge_retrieval/entities.py
+++ b/api/core/workflow/nodes/knowledge_retrieval/entities.py
@@ -47,5 +47,5 @@ class KnowledgeRetrievalNodeData(BaseNodeData):
     query_variable_selector: list[str]
     dataset_ids: list[str]
     retrieval_mode: Literal['single', 'multiple']
-    multiple_retrieval_config: Optional[MultipleRetrievalConfig]
-    singleRetrievalConfig: Optional[SingleRetrievalConfig]
+    multiple_retrieval_config: Optional[MultipleRetrievalConfig] = None
+    singleRetrievalConfig: Optional[SingleRetrievalConfig] = None