diff --git a/FO/Views/Shared/Partial/OkCert3.cshtml b/FO/Views/Shared/Partial/OkCert3.cshtml
index 7e4c1c7..5900718 100644
--- a/FO/Views/Shared/Partial/OkCert3.cshtml
+++ b/FO/Views/Shared/Partial/OkCert3.cshtml
@@ -19,6 +19,10 @@
     });
     function certok3reqview(sel, reason, param1, param2) {
         var popupWindow = window.open("/Account/CertOk3Req?sel=" + sel + "&reason=" + reason + (param1 ? "&param1=" + param1 : "") + (param2 ? "&param2=" + param2 : ""), "auth_popup", "width=450,height=640,scrollbar=yes,resizable=no");
-        popupWindow.focus();
+        if (popupWindow == null) {
+            msg("팝업이 차단되어 있습니다. 차단을 해제해 주세요.");
+        } else {
+            popupWindow.focus();
+        }
     }
 </script>
\ No newline at end of file