diff --git a/bbs/write_update.php b/bbs/write_update.php
index ac32277e6..dbda388ef 100644
--- a/bbs/write_update.php
+++ b/bbs/write_update.php
@@ -658,7 +658,7 @@ for ($i=(int)$row['max_bf_no']; $i>=0; $i--)
     $row2 = sql_fetch(" select bf_file from {$g5['board_file_table']} where bo_table = '{$bo_table}' and wr_id = '{$wr_id}' and bf_no = '{$i}' ");
 
     // 정보가 있다면 빠집니다.
-    if ($row2['bf_file']) break;
+    if (isset($row2['bf_file']) && $row2['bf_file']) break;
 
     // 그렇지 않다면 정보를 삭제합니다.
     sql_query(" delete from {$g5['board_file_table']} where bo_table = '{$bo_table}' and wr_id = '{$wr_id}' and bf_no = '{$i}' ");
@@ -725,8 +725,10 @@ if (!($w == 'u' || $w == 'cu') && $config['cf_email_use'] && $board['bo_use_emai
     }
 
     // 옵션에 메일받기가 체크되어 있고, 게시자의 메일이 있다면
-    if (strstr($wr['wr_option'], 'mail') && $wr['wr_email'])
-        $array_email[] = $wr['wr_email'];
+    if (isset($wr['wr_option']) && isset($wr['wr_email'])) {
+        if (strstr($wr['wr_option'], 'mail') && $wr['wr_email'])
+            $array_email[] = $wr['wr_email'];
+    }
 
     // 중복된 메일 주소는 제거
     $unique_email = array_unique($array_email);
diff --git a/lib/common.lib.php b/lib/common.lib.php
index d84af1501..b7493f18d 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -850,12 +850,14 @@ function get_admin($admin='super', $fields='*')
         $is = true;
     }
 
-    if (($is && !$mb['mb_id']) || $admin == 'group') {
+    // if (($is && !$mb['mb_id']) || $admin == 'group') {
+    if (($is && !isset($mb['mb_id'])) || $admin == 'group') {
         $mb = sql_fetch("select {$fields} from {$g5['member_table']} where mb_id in ('{$group['gr_admin']}') limit 1 ");
         $is = true;
     }
 
-    if (($is && !$mb['mb_id']) || $admin == 'super') {
+    // if (($is && !$mb['mb_id']) || $admin == 'super') {
+    if (($is && !isset($mb['mb_id'])) || $admin == 'super') {
         $mb = sql_fetch("select {$fields} from {$g5['member_table']} where mb_id in ('{$config['cf_admin']}') limit 1 ");
     }
 
diff --git a/skin/member/basic/login.skin.php b/skin/member/basic/login.skin.php
index 15f94e3a7..d282aeba2 100644
--- a/skin/member/basic/login.skin.php
+++ b/skin/member/basic/login.skin.php
@@ -39,7 +39,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
     </div>
 
     <?php // 쇼핑몰 사용시 여기부터 ?>
-    <?php if ($default['de_level_sell'] == 1) { // 상품구입 권한 ?>
+    <?php if (isset($default['de_level_sell']) && $default['de_level_sell'] == 1) { // 상품구입 권한 ?>
 
 	<!-- 주문하기, 신청하기 -->
 	<?php if (preg_match("/orderform.php/", $url)) { ?>