diff --git a/tool_core.js b/tool_core.js
index f8061de..41cca3b 100644
--- a/tool_core.js
+++ b/tool_core.js
@@ -332,23 +332,24 @@ module.exports = {
   // 返回新的数组
   filter_story (story) {
     if (Array.isArray(story) && story.length) {
-      // section can contain property '_xxx' which shall not change filter result.
       return story.filter((section) => {
         if (!section) return false
-        return Object.entries(section).some(([key, val]) => !key.startsWith('_') && !this.is_empty(val))
+        return Object.values(section).some((val) => !this.is_empty(val))
+        //return Object.entries(section).some(([key, val]) => !key.startsWith('_') && !this.is_empty(val)) // don't check properties '_xxx'
       })
     } else {
       return []
     }
   },
 
+  // 20250621 todo 如果 text 是 {enUS,zhCN} 怎么处理
   extract_story_title (story) {
     if (Array.isArray(story) && story.length) {
       return (
         story
-          .map(({ text = '' } = {}) => text.trim().replace(/\n/g, ' '))
-          .join(' ')
-          .substring(0, 140) || ''
+          .map(({ text = '' } = {}) => text.trim?.()?.replace?.(/\n/g, ' '))
+          ?.join(' ')
+          ?.substring?.(0, 140) || ''
       )
     } else {
       return ''