diff --git a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
index a3f9bcd539..7c2d26bb82 100644
--- a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
+++ b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
@@ -238,7 +238,8 @@ class KnowledgeRetrievalNode(BaseNode):
                 # get retrieval method
                 retrival_method = retrieval_model_config['search_method']
                 # get reranking model
-                reranking_model = retrieval_model_config['reranking_model']
+                reranking_model=retrieval_model_config['reranking_model'] \
+                    if retrieval_model_config['reranking_enable'] else None
                 # get score threshold
                 score_threshold = .0
                 score_threshold_enabled = retrieval_model_config.get("score_threshold_enabled")