diff --git a/db.js b/db.js
index 771b25d..03e9d38 100644
--- a/db.js
+++ b/db.js
@@ -159,7 +159,7 @@ class DB {
     const {err, rows} = await this.ormSelect(tblName, whereList);
     return {
       'err': err,
-      'row': rows.length > 0 ? rows[0] : null
+      'row': rows && rows.length > 0 ? rows[0] : null
     };
   }