diff --git a/adm/sms_admin/num_book.php b/adm/sms_admin/num_book.php
index f4338c307..d6a658567 100644
--- a/adm/sms_admin/num_book.php
+++ b/adm/sms_admin/num_book.php
@@ -13,12 +13,12 @@ $g5['title'] = "휴대폰번호 관리";
 
 if ($page < 1) $page = 1;
 
-$bg_no = isset($bg_no) ? (int) $bg_no : 0;
+$bg_no = isset($bg_no) ? preg_replace('/[^0-9]/i', '', $bg_no) : '';
 $st = isset($st) ? preg_replace('/[^a-z0-9]/i', '', $st) : '';
 
 $sql_korean = $sql_group = $sql_search = $sql_no_hp = '';
 
-if (is_numeric($bg_no))
+if (is_numeric($bg_no) && $bg_no)
     $sql_group = " and bg_no='$bg_no' ";
 else
     $sql_group = "";