diff --git a/public/sitemap-0.xml b/public/sitemap-0.xml
index 6df27fd..deffdaf 100644
--- a/public/sitemap-0.xml
+++ b/public/sitemap-0.xml
@@ -1,121 +1,122 @@
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+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Der_Anfang_vom_Anfang/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Unabhängigkeit/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Ich dichte, du dichtest, gauß ist am dichtesten/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Vectorrrr/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Konvergenz/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Einfach, Einfacher, Ordnungsstatistik/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Inferenzstatistik/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Hab Güte Gott/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
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+<url><loc>https://htwr-aachen.de/wsi/studium/teachings/Testtheorie/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Wichtige-Probleme/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Dein-Leben-Problemsammlung/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Turing-die-Maschine/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Karmantor-Deregistrierungsmaschine/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Unterprogrammtech-nik/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Im-E1-Ist-Ein-Sack-Rice-Umgefallen/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Reduktion-deiner-Note/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/While-true/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Komplexität-von-BuK/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/NTM/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/Das-mir-zu-komplex/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://htwr-aachen.de/scil/studium/teachings/grohendes Ende/</loc><lastmod>2024-03-09T15:36:15.406Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
 </urlset>
\ No newline at end of file
diff --git a/src/app/api/panikzettel/route.ts b/src/app/api/panikzettel/route.ts
index 5dfbc04..8c1f1a5 100644
--- a/src/app/api/panikzettel/route.ts
+++ b/src/app/api/panikzettel/route.ts
@@ -18,7 +18,7 @@ export type Panikzettel = PanikzettelMetadata & {
 
 const storage = new Storage({
   projectId: process.env.GCS_PROJECT_ID,
-  credentials: JSON.parse(process.env.GCS_SERVICE_KEY || ""),
+  credentials: JSON.parse(process.env.GCS_SERVICE_KEY || "{}"),
 });
 
 // The helper function to read the file from GCP
@@ -66,13 +66,16 @@ async function downloadMetadata(): Promise<PanikzettelMetadataMap> {
 }
 
 export async function GET(req: NextRequest) {
+  if (!process.env.GCS_SERVICE_KEY) {
+    return new Response("[]", { status: 200 });
+  }
   const excludeMetadata =
     req.nextUrl.searchParams.get("excludeMetadata") === "true";
 
   try {
     const namings = await downloadMetadata();
     if (!namings) {
-      return new Response(JSON.stringify([]), { status: 200 });
+      return new Response("[]", { status: 200 });
     }
     const files = await readFiles(
       namings,
@@ -80,6 +83,6 @@ export async function GET(req: NextRequest) {
     );
     return new Response(JSON.stringify(files), { status: 200 });
   } catch (err) {
-    return new Response(JSON.stringify([]), { status: 200 });
+    return new Response("[]", { status: 200 });
   }
 }
diff --git a/src/app/panikzettel/page.tsx b/src/app/panikzettel/page.tsx
index ecc9f53..2bde193 100644
--- a/src/app/panikzettel/page.tsx
+++ b/src/app/panikzettel/page.tsx
@@ -28,7 +28,11 @@ async function getData(): Promise<Panikzettel[]> {
   if (!res.ok) {
     return [];
   }
-  return res.json();
+  try {
+    return await res.json();
+  } catch (_err) {
+    return [];
+  }
 }
 
 function Panikzettellist(props: {