diff --git a/extend/base/helper.php b/extend/base/helper.php
index f6c44c1..d43419e 100644
--- a/extend/base/helper.php
+++ b/extend/base/helper.php
@@ -270,7 +270,7 @@ function event_handle_result($name, $key, $type = 'all', $params = []) : array
 }
 
 /**
- * 字符拼接通用处理函数
+ * 字符拼接通用处理函数.
  *
  * @param string $name
  * @param string $type
@@ -286,7 +286,7 @@ function event_handle_string($name, $type)
 
 function event_view_content($name)
 {
-   return event_handle_string($name, 'view_content');
+    return event_handle_string($name, 'view_content');
 }
 
 function event_view_replace($content, $name)
@@ -418,3 +418,13 @@ if (!function_exists('get_site_version_key')) {
         return sysconfig('site', 'site_version') . '-' . Version::VERSION . '-' . Version::PRODUCT_VERSION . '-' . Version::LAYUI_VERSION;
     }
 }
+if (!function_exists('format_null_value')) {
+    function format_null_value($value)
+    {
+        if (is_null($value)) {
+            return '';
+        }
+
+        return $value;
+    }
+}
diff --git a/extend/think/template/taglib/Cx.php b/extend/think/template/taglib/Cx.php
index cbbfabe..5faedcd 100644
--- a/extend/think/template/taglib/Cx.php
+++ b/extend/think/template/taglib/Cx.php
@@ -385,7 +385,7 @@ class Cx extends Taglib
 
         if ('$' == $flag || ':' == $flag) {
             $value = $this->autoBuildVar($value);
-            $str   = 'is_array(' . $value . ')?' . $value . ':explode(\',\',' . $value . ')';
+            $str   = 'is_array(' . $value . ')?' . $value . ':explode(\',\',format_null_value(' . $value . '))';
         } else {
             $value = '"' . $value . '"';
             $str   = 'explode(\',\',' . $value . ')';