diff --git a/config.php b/config.php
index 181913d7e..71480a867 100644
--- a/config.php
+++ b/config.php
@@ -5,8 +5,8 @@
 ********************/
 
 define('G5_VERSION', '그누보드5');
-define('G5_GNUBOARD_VER', '5.4.5');
-define('G5_YOUNGCART_VER', '5.4.5');
+define('G5_GNUBOARD_VER', '5.4.5.1');
+define('G5_YOUNGCART_VER', '5.4.5.1');
 
 // 이 상수가 정의되지 않으면 각각의 개별 페이지는 별도로 실행될 수 없음
 define('_GNUBOARD_', true);
diff --git a/lib/cache.lib.php b/lib/cache.lib.php
index 25790dd92..b416ea539 100644
--- a/lib/cache.lib.php
+++ b/lib/cache.lib.php
@@ -96,7 +96,7 @@ function g5_delete_cache_by_prefix($key){
     $cache = get_cachemanage_instance();
     $files = null;
 
-    if( (is_object($instance) && get_class($instance) === 'FileCache') ) {
+    if( (is_object($cache) && get_class($cache) === 'FileCache') ) {
         $files = glob(G5_DATA_PATH.'/cache/'.$key.'*');
 
         foreach( (array) $files as $filename){
@@ -106,7 +106,7 @@ function g5_delete_cache_by_prefix($key){
         }
     }
 
-    $files = run_replace('g5_delete_cache_by_prefix', $files, $key);
+    $files = run_replace('g5_delete_cache_by_prefix', $files, $key, $cache);
 
     return ($files) ? true : false;
 }
\ No newline at end of file