diff --git a/src/scripts/app.ts b/src/scripts/app.ts
index 853242bf0..43722f9b4 100644
--- a/src/scripts/app.ts
+++ b/src/scripts/app.ts
@@ -1121,6 +1121,13 @@ export class ComfyApp {
       nodes: ComfyWorkflowJSON['nodes'],
       path: string = ''
     ) => {
+      if (!Array.isArray(nodes)) {
+        console.warn(
+          'Workflow nodes data is missing or invalid, skipping node processing',
+          { nodes, path }
+        )
+        return
+      }
       for (let n of nodes) {
         // Patch T2IAdapterLoader to ControlNetLoader since they are the same node now
         if (n.type == 'T2IAdapterLoader') n.type = 'ControlNetLoader'