diff --git a/services/NormalBot.php b/services/NormalBot.php
index 0468d4d..4dac10d 100644
--- a/services/NormalBot.php
+++ b/services/NormalBot.php
@@ -307,7 +307,7 @@ class NormalBot
             'meta_group'    => $group,
             'meta_key'      => $key,
             'next_node'     => $nextNode,
-            '__valid_ids'   => array_merge(array_column($items, $valueField), $redirectIds),
+            '__valid_ids'   => array_merge(array_map('strval', array_column($items, $valueField)), $redirectIds),
             '__label_map'   => $labelMap,
             '__redirect_ids'=> $redirectIds,
         ];