diff --git a/.gitignore b/.gitignore
index d6244e1..8d9d3c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ yarn-error.log
 package-lock.json
 yarn.lock
 **DS_Store
+.claude
diff --git a/src/components/pages/UserPage.tsx b/src/components/pages/UserPage.tsx
index 37af567..06686f1 100644
--- a/src/components/pages/UserPage.tsx
+++ b/src/components/pages/UserPage.tsx
@@ -59,7 +59,7 @@ export default function UserPage() {
             {/* Favorite Card Section */}
             {user.fav && user.fav !== '0' && cards?.data && (
               (() => {
-                const favCard = cards.data.find(card => card.id === parseInt(user.fav));
+                const favCard = cards.data.find(card => card.id === parseInt(user.fav || '0'));
                 if (favCard) {
                   return (
                     <div className="mb-8">
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index 5dcbecc..d116e65 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -9,7 +9,8 @@ export const SKILL_ICONS = {
   yui: 'icon-ai',
   '3d': '■',
   model: 'fa-solid fa-cube',
-  first: 'icon-moji_a'
+  first: 'icon-moji_a',
+  normal: ''
 } as const;
 
 export const PLANET_THRESHOLDS = {