diff --git a/web/app/components/base/prompt-editor/plugins/workflow-variable-block/node.tsx b/web/app/components/base/prompt-editor/plugins/workflow-variable-block/node.tsx
index e4154731ba..9fa518218f 100644
--- a/web/app/components/base/prompt-editor/plugins/workflow-variable-block/node.tsx
+++ b/web/app/components/base/prompt-editor/plugins/workflow-variable-block/node.tsx
@@ -18,7 +18,7 @@ export class WorkflowVariableBlockNode extends DecoratorNode<JSX.Element> {
   }
 
   static clone(node: WorkflowVariableBlockNode): WorkflowVariableBlockNode {
-    return new WorkflowVariableBlockNode(node.__variables, node.__workflowNodesMap)
+    return new WorkflowVariableBlockNode(node.__variables, node.__workflowNodesMap, node.__key)
   }
 
   isInline(): boolean {