diff --git a/skin/member/basic/register_form.skin.php b/skin/member/basic/register_form.skin.php
index 5afac4f41..32b4e3be2 100644
--- a/skin/member/basic/register_form.skin.php
+++ b/skin/member/basic/register_form.skin.php
@@ -342,7 +342,7 @@ function fregisterform_submit(f)
         }
     }
 
-    if (typeof(f.mb_recommend) != "undefined") {
+    if (typeof(f.mb_recommend) != "undefined" && f.mb_recommend.value) {
         if (f.mb_id.value == f.mb_recommend.value) {
             alert("본인을 추천할 수 없습니다.");
             f.mb_recommend.focus();