diff --git a/app/wiki/[...id]/page.tsx b/app/wiki/[...id]/page.tsx
index 2054b3d..eeba67b 100644
--- a/app/wiki/[...id]/page.tsx
+++ b/app/wiki/[...id]/page.tsx
@@ -53,7 +53,7 @@ export async function generateMetadata({ params }: Props) {
         block.text.elements[0].text_run.content === "description")
     ) {
       // delete colon
-      description = block.text.elements[1].text_run.content.slice(1);
+      description = block.text.elements[1]?.text_run.content.slice(1);
       break;
     }
   }
diff --git a/package-lock.json b/package-lock.json
index 7974d8b..33ecf86 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
         "lucide-react": "^0.408.0",
         "nanoid": "^5.0.7",
         "next": "14.2.4",
+        "next-themes": "^0.3.0",
         "prism-react-renderer": "^2.3.1",
         "prismjs": "^1.29.0",
         "react": "^18",
@@ -4961,6 +4962,15 @@
         }
       }
     },
+    "node_modules/next-themes": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/next-themes/-/next-themes-0.3.0.tgz",
+      "integrity": "sha512-/QHIrsYpd6Kfk7xakK4svpDI5mmXP0gfvCoJdGpZQ2TOrQZmsW0QxjaiLn8wbIKjtm4BTSqLoix4lxYYOnLJ/w==",
+      "peerDependencies": {
+        "react": "^16.8 || ^17 || ^18",
+        "react-dom": "^16.8 || ^17 || ^18"
+      }
+    },
     "node_modules/next/node_modules/nanoid": {
       "version": "3.3.7",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.7.tgz",