diff --git a/interface/web/client/form/client.tform.php b/interface/web/client/form/client.tform.php
index 8de41055392a576a3ff6b88778d4ca04e7196f40..4415768d62d6b9043391265b9e984f4b0b8d44c2 100644
--- a/interface/web/client/form/client.tform.php
+++ b/interface/web/client/form/client.tform.php
@@ -501,7 +501,7 @@ $form["tabs"]['address'] = array (
 					'type' => 'TOLOWER')
 			),
 			'validators' => array (
-				0 => array ( 'type' => 'ISEMAIL', 'errmsg'=> 'email_error_isemail'),
+				0 => array ( 'type' => 'ISEMAIL', 'allowempty' => 'y', 'errmsg'=> 'email_error_isemail'),
 			),
 			'default' => '',
 			'value'  => '',
diff --git a/interface/web/client/form/reseller.tform.php b/interface/web/client/form/reseller.tform.php
index 9bc416fd6247d8dfc2d49fd879b5c3e6bf307b58..8f4e5baf6dab40b82d785e0c7fd5024e437b8f36 100644
--- a/interface/web/client/form/reseller.tform.php
+++ b/interface/web/client/form/reseller.tform.php
@@ -499,7 +499,7 @@ $form["tabs"]['address'] = array (
 					'type' => 'TOLOWER')
 			),
 			'validators' => array (
-				0 => array ( 'type' => 'ISEMAIL', 'errmsg'=> 'paypal_email_error_isemail'),
+				0 => array ( 'type' => 'ISEMAIL', 'allowempty' => 'y', 'errmsg'=> 'paypal_email_error_isemail'),
 			),
 			'default' => '',
 			'value'  => '',