From 622d7045bdfc3f884fd58f0e1ab85fb359158a57 Mon Sep 17 00:00:00 2001
From: Manuel Schiller <manuel.schiller@caligano.de>
Date: Fri, 17 Oct 2025 19:27:44 +0200
Subject: [PATCH] fix: fallback if origin is 'null'

fixes #5509
---
 packages/router-core/src/router.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/router-core/src/router.ts b/packages/router-core/src/router.ts
index 78b5e11608b..01bc02a7473 100644
--- a/packages/router-core/src/router.ts
+++ b/packages/router-core/src/router.ts
@@ -969,7 +969,7 @@ export class RouterCore<
 
     this.origin = this.options.origin
     if (!this.origin) {
-      if (!this.isServer) {
+      if (!this.isServer && window?.origin && window.origin !== 'null') {
         this.origin = window.origin
       } else {
         // fallback for the server, can be overridden by calling router.update({origin}) on the server