diff --git a/src/hooks/useSuitable.ts b/src/hooks/useSuitable.ts
index eb0b366..574e580 100644
--- a/src/hooks/useSuitable.ts
+++ b/src/hooks/useSuitable.ts
@@ -285,9 +285,9 @@ export function useSuitable() {
   const downloadSuitablePdf = async (): Promise<void> => {
     try {
       const { ids, detailIds } = serializeSelectedItems()
-      const fileTitle = `(${
-        suitableCommCode.get(SUITABLE_HEAD_CODE.ROOF_MATL_GRP_CD)?.find((category) => category.code === searchCategory)?.codeJp
-      }) 屋根材適合表`
+
+      const category = suitableCommCode.get(SUITABLE_HEAD_CODE.ROOF_MATL_GRP_CD)?.find((category) => category.code === searchCategory)?.codeJp
+      const fileTitle = category ? `(${category}) 屋根材適合表` : '屋根材適合表'
 
       const form = document.createElement('form')
       form.method = 'POST'