diff --git a/.changeset/hip-elephants-judge.md b/.changeset/hip-elephants-judge.md
new file mode 100644
index 000000000000..95f303163db2
--- /dev/null
+++ b/.changeset/hip-elephants-judge.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Ensure router is initialized before parsing location
diff --git a/packages/kit/src/runtime/client/renderer.js b/packages/kit/src/runtime/client/renderer.js
index 047671e201d1..537c2dee7619 100644
--- a/packages/kit/src/runtime/client/renderer.js
+++ b/packages/kit/src/runtime/client/renderer.js
@@ -109,7 +109,7 @@ export class Renderer {
 		this.stores.session.subscribe(async (value) => {
 			this.$session = value;
 
-			if (!ready) return;
+			if (!ready || !this.router) return;
 			this.session_id += 1;
 
 			const info = this.router.parse(new URL(location.href));