diff --git a/app/Repositories/SettingRepository.php b/app/Repositories/SettingRepository.php
index c483fbc1..fe92bc93 100644
--- a/app/Repositories/SettingRepository.php
+++ b/app/Repositories/SettingRepository.php
@@ -52,6 +52,7 @@ public function store(array $params)
         do_log("sql: $sql, result: $result");
         NexusDB::cache_del("nexus_settings_in_laravel");
         NexusDB::cache_del("nexus_settings_in_nexus");
+        NexusDB::cache_del('setting_protected_forum');
         return $result;
     }
 
diff --git a/include/globalfunctions.php b/include/globalfunctions.php
index c821af7c..e976e365 100644
--- a/include/globalfunctions.php
+++ b/include/globalfunctions.php
@@ -1025,6 +1025,7 @@ function clear_setting_cache()
     do_log("clear_setting_cache");
     \Nexus\Database\NexusDB::cache_del('nexus_settings_in_laravel');
     \Nexus\Database\NexusDB::cache_del('nexus_settings_in_nexus');
+    \Nexus\Database\NexusDB::cache_del('setting_protected_forum');
     $channel = nexus_env("CHANNEL_NAME_SETTING");
     if (!empty($channel)) {
         \Nexus\Database\NexusDB::redis()->publish($channel, "update");