From 5b77f0f0d04d95bfdb1bad657c29b2620198d6f9 Mon Sep 17 00:00:00 2001
From: zhouxin <zhouxin@easycorp.ltd>
Date: Tue, 15 Mar 2022 01:06:43 +0000
Subject: [PATCH] Fix bug #20654.

---
 lib/base/filter/filter.class.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/base/filter/filter.class.php b/lib/base/filter/filter.class.php
index 86f57f8b92..f693a0cb6c 100644
--- a/lib/base/filter/filter.class.php
+++ b/lib/base/filter/filter.class.php
@@ -329,7 +329,7 @@ class baseValidater
      */
     public static function checkNotEmpty($var)
     {
-        return !empty($var);
+        return !empty($var) or $var === '0';
     }
 
     /**