From 29c7735d077ed1b20436c07dcf07bc2cbc4c4375 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Thu, 15 Oct 2026 07:46:48 +0200
Subject: [PATCH] Fix exception when time zone of browser unavailable

---
 apps/client/src/app/core/auth.interceptor.ts | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/apps/client/src/app/core/auth.interceptor.ts b/apps/client/src/app/core/auth.interceptor.ts
index 04be154786..b42c372be1 100644
--- a/apps/client/src/app/core/auth.interceptor.ts
+++ b/apps/client/src/app/core/auth.interceptor.ts
@@ -38,10 +38,13 @@ export class AuthInterceptor implements HttpInterceptor {
       return next.handle(request);
     }
 
-    let headers = request.headers.set(
-      HEADER_KEY_TIMEZONE,
-      Intl?.DateTimeFormat().resolvedOptions().timeZone
-    );
+    let headers = request.headers;
+
+    const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+
+    if (timezone) {
+      headers = headers.set(HEADER_KEY_TIMEZONE, timezone);
+    }
 
     const token = this.tokenStorageService.getToken();