--- mp_masspay\mp_masspay.module	2011-08-14 13:30:44.000000000 -0400
+++ mp_masspay\mp_masspay.module	2011-08-13 22:20:40.000000000 -0400
@@ -81,14 +81,14 @@
           '#default_value' => $edit['manual_pay_details'],
         );
       }
       return $form;
     }
   }
-  elseif ($op == 'validate' && !empty($edit['paypal_email'])) {
-    if ($edit['payment_method'] == 0) {
+  elseif ($op == 'validate' && isset($edit['paypal_email'])) {
+    if ($edit['payment_method'] == 0 && !empty($edit['paypal_email'])) {
       if (!eregi('^[a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.([a-zA-Z]{2,4})$' , $edit['paypal_email'])) {
         form_set_error('paypal_email', t('Please enter a valid Paypal email address.'));
        }
     }
   }
 }