diff --git a/src/formkit/inputs/category-select/components/CategoryTag.vue b/src/formkit/inputs/category-select/components/CategoryTag.vue
index 37a19b40..f8e02b53 100644
--- a/src/formkit/inputs/category-select/components/CategoryTag.vue
+++ b/src/formkit/inputs/category-select/components/CategoryTag.vue
@@ -24,7 +24,7 @@ const label = computed(() => {
     props.category.metadata.name
   );
   return categories
-    .map((category: CategoryTree) => category.spec.displayName)
+    ?.map((category: CategoryTree) => category.spec.displayName)
     .join(" / ");
 });
 </script>
diff --git a/src/formkit/inputs/category-select/components/SearchResultListItem.vue b/src/formkit/inputs/category-select/components/SearchResultListItem.vue
index 5e7c80c7..5cc7bab5 100644
--- a/src/formkit/inputs/category-select/components/SearchResultListItem.vue
+++ b/src/formkit/inputs/category-select/components/SearchResultListItem.vue
@@ -33,7 +33,7 @@ const label = computed(() => {
     props.category.metadata.name
   );
   return categories
-    .map((category: CategoryTree) => category.spec.displayName)
+    ?.map((category: CategoryTree) => category.spec.displayName)
     .join(" / ");
 });
 </script>
diff --git a/src/modules/contents/posts/categories/utils/index.ts b/src/modules/contents/posts/categories/utils/index.ts
index 13a9768c..0169e97e 100644
--- a/src/modules/contents/posts/categories/utils/index.ts
+++ b/src/modules/contents/posts/categories/utils/index.ts
@@ -126,7 +126,7 @@ export const getCategoryPath = (
   categories: CategoryTree[],
   name: string,
   path: CategoryTree[] = []
-) => {
+): CategoryTree[] | undefined => {
   for (const category of categories) {
     if (category.metadata && category.metadata.name === name) {
       return path.concat([category]);