diff --git a/classes/db/DB.class.php b/classes/db/DB.class.php
index 8d51493b7..a91b32e9b 100644
--- a/classes/db/DB.class.php
+++ b/classes/db/DB.class.php
@@ -577,6 +577,10 @@ class DB
 		{
 			return $output;
 		}
+		if(!is_object($output) || !method_exists($output, 'getAction'))
+		{
+			return new Object(-1, sprintf(lang('msg_failed_to_load_query'), $query_id));
+		}
 
 		// execute appropriate query
 		switch($output->getAction())
diff --git a/common/lang/en.php b/common/lang/en.php
index a25ad207c..59c2bc51c 100644
--- a/common/lang/en.php
+++ b/common/lang/en.php
@@ -225,6 +225,7 @@ $lang->msg_call_server = 'Requesting to the server, please wait.';
 $lang->msg_db_not_setted = 'DB configuration has not been set.';
 $lang->msg_dbconnect_failed = 'Error has occurred while connecting to the DB. Please check the DB information again.';
 $lang->msg_invalid_queryid = 'Specified query ID value is invalid.';
+$lang->msg_failed_to_load_query = 'Failed to load query %s.';
 $lang->msg_not_permitted = 'You do not have permission to access.';
 $lang->msg_input_password = 'Please type the password.';
 $lang->msg_invalid_document = 'Invalid Article Number';
diff --git a/common/lang/ko.php b/common/lang/ko.php
index 043e085a2..7c9b0af7b 100644
--- a/common/lang/ko.php
+++ b/common/lang/ko.php
@@ -225,6 +225,7 @@ $lang->msg_call_server = '서버에 요청 중입니다. 잠시만 기다려 주
 $lang->msg_db_not_setted = 'DB 설정이 되어 있지 않습니다.';
 $lang->msg_dbconnect_failed = 'DB 접속 오류가 발생했습니다. DB정보를 다시 확인해주세요.';
 $lang->msg_invalid_queryid = 'Query ID값이 잘못 지정되었습니다.';
+$lang->msg_failed_to_load_query = '%s 쿼리가 정상적으로 로딩되지 않았습니다.';
 $lang->msg_not_permitted = '권한이 없습니다.';
 $lang->msg_input_password = '비밀번호를 입력하세요.';
 $lang->msg_invalid_document = '잘못된 문서번호입니다.';