diff --git a/plugin/social/register_member_update.php b/plugin/social/register_member_update.php
index dc826fd96..db74e8f5c 100644
--- a/plugin/social/register_member_update.php
+++ b/plugin/social/register_member_update.php
@@ -41,15 +41,10 @@ if($tmp_mb_nick != $mb_nick) {
     alert('닉네임을 올바르게 입력해 주십시오.');
 }
 
-if( $mb_password ){
+if( ! isset($mb_password) || ! $mb_password ){
 
-    if ($w == '' && !$mb_password)
-        alert('비밀번호가 넘어오지 않았습니다.');
-    if($w == '' && $mb_password != $mb_password_re)
-        alert('비밀번호가 일치하지 않습니다.');
+    $mb_password = md5(pack('V*', rand(), rand(), rand(), rand()));
 
-} else {
-    $mb_password = '';
 }
 
 if ($msg = empty_mb_name($mb_name))       alert($msg, "", true, true);