diff --git a/web/app/components/workflow/hooks/use-workflow-run-event/use-workflow-node-started.ts b/web/app/components/workflow/hooks/use-workflow-run-event/use-workflow-node-started.ts
index b537ccbb27..f1f184d4bb 100644
--- a/web/app/components/workflow/hooks/use-workflow-run-event/use-workflow-node-started.ts
+++ b/web/app/components/workflow/hooks/use-workflow-run-event/use-workflow-node-started.ts
@@ -67,6 +67,9 @@ export const useWorkflowNodeStarted = () => {
 
       incomeEdges.forEach((edge) => {
         const incomeNode = nodes.find(node => node.id === edge.source)!
+        if (!incomeNode || !('data' in incomeNode))
+           return
+
         if (
           (!incomeNode.data._runningBranchId && edge.sourceHandle === 'source')
           || (incomeNode.data._runningBranchId && edge.sourceHandle === incomeNode.data._runningBranchId)