diff --git a/bbs/member_cert_refresh_update.php b/bbs/member_cert_refresh_update.php
index 7300bc277..078e0f8f7 100644
--- a/bbs/member_cert_refresh_update.php
+++ b/bbs/member_cert_refresh_update.php
@@ -25,7 +25,7 @@ if($config['cf_cert_use'] && get_session('ss_cert_type') && get_session('ss_cert
     // 중복체크
     $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '".get_session('ss_cert_dupinfo')."' ";
     $row = sql_fetch($sql);
-    if ($row['mb_id']) {
+    if (!empty($row['mb_id'])) {
         alert("입력하신 본인확인 정보로 가입된 내역이 존재합니다.");
     }
 }
diff --git a/bbs/register_form_update.php b/bbs/register_form_update.php
index 4d79cee6a..76b3ca1e8 100644
--- a/bbs/register_form_update.php
+++ b/bbs/register_form_update.php
@@ -166,7 +166,7 @@ if($config['cf_cert_use'] && get_session('ss_cert_type') && get_session('ss_cert
     // 중복체크
     $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '".get_session('ss_cert_dupinfo')."' ";
     $row = sql_fetch($sql);
-    if ($row['mb_id']) {
+    if (!empty($row['mb_id'])) {
         alert("입력하신 본인확인 정보로 가입된 내역이 존재합니다.");
     }
 }