diff --git a/src/apps/search.php b/src/apps/search.php
index a45b1ea4..3c2975b1 100755
--- a/src/apps/search.php
+++ b/src/apps/search.php
@@ -57,7 +57,7 @@ $typeid = intval($typeid);
 $keyword = addslashes(cn_substr($keyword, 30));
 $typeid = intval($typeid);
 //判断关键词是否输入违禁词，在后台-系统设置：禁用关键词添加
-if (preg_match("#".$cfg_notallowstr."#i", $keyword)) {
+if (!empty($cfg_notallowstr) && preg_match("#".$cfg_notallowstr."#i", $keyword)) {
     ShowMsg("您输入的关键词存在违禁，请重新填写", "-1");
     exit();
 }