diff --git a/src/panels/config/integrations/integration-panels/thread/thread-config-panel.ts b/src/panels/config/integrations/integration-panels/thread/thread-config-panel.ts
index 206ab96194..e0da88509d 100644
--- a/src/panels/config/integrations/integration-panels/thread/thread-config-panel.ts
+++ b/src/panels/config/integrations/integration-panels/thread/thread-config-panel.ts
@@ -482,7 +482,9 @@ export class ThreadConfigPanel extends SubscribeMixin(LitElement) {
     const network = (ev.currentTarget as any).network as ThreadNetwork;
     const router = (ev.currentTarget as any).router as ThreadRouter;
     const otbr = (ev.currentTarget as any).otbr as OTBRInfo;
-    const index = Number(ev.detail.index);
+    const index = network.dataset
+      ? Number(ev.detail.index)
+      : Number(ev.detail.index) + 1;
     switch (index) {
       case 0:
         this._setPreferredBorderAgent(network.dataset!, router);