hooks

web/app/components/workflow/hooks/use-workflow.ts

@@ -93,6 +93,7 @@ export const useWorkflow = () => {
       return list
 
     const traverse = (root: Node, callback: (node: Node) => void) => {
+      if (root) {
         const incomers = getIncomers(root, nodes, edges)
 
         if (incomers.length) {
@@ -102,12 +103,13 @@ export const useWorkflow = () => {
           })
         }
       }
+    }
     traverse(currentNode, (node) => {
       list.push(node)
     })
 
     const length = list.length
-    if (length && list.some(item => item.data.type === BlockEnum.Start)) {
+    if (length) {
       return list.reverse().filter((item) => {
         return SUPPORT_OUTPUT_VARS_NODE.includes(item.data.type)
       })