diff --git a/components/pages/home/LoginButton.tsx b/components/pages/home/LoginButton.tsx
index 1bcdee3..b5e866a 100644
--- a/components/pages/home/LoginButton.tsx
+++ b/components/pages/home/LoginButton.tsx
@@ -6,7 +6,11 @@ import Link from "next/link";
 
 export function LoginButton() {
   const { data: session } = useSession();
-  const params = new URLSearchParams(document.location.search);
+  const callbackUrl =
+    typeof window === "undefined"
+      ? undefined
+      : new URLSearchParams(document.location.search).get("callbackUrl") ??
+        undefined;
 
   if (session) {
     return (
@@ -31,7 +35,7 @@ export function LoginButton() {
         variant="outline"
         onClick={() =>
           signIn("authentik", {
-            callbackUrl: params.get("callbackUrl") ?? undefined,
+            callbackUrl,
           })
         }
       >