diff --git a/app/call_block/call_block.php b/app/call_block/call_block.php
index d0307f0cdf..d8ca6d88d5 100644
--- a/app/call_block/call_block.php
+++ b/app/call_block/call_block.php
@@ -17,7 +17,7 @@
 
 	The Initial Developer of the Original Code is
 	Mark J Crane <markjcrane@fusionpbx.com>
-	Portions created by the Initial Developer are Copyright (C) 2008-2012
+	Portions created by the Initial Developer are Copyright (C) 2008-2019
 	the Initial Developer. All Rights Reserved.
 
 	Contributor(s):
@@ -101,7 +101,7 @@
 //prepare to page the results
 	$sql = "select count(*) from view_call_block ";
 	$sql .= "where domain_uuid = :domain_uuid ";
-	if (!permission_exists('call_block_all') && count($_SESSION['user']['extension']) > 0) {
+	if (!permission_exists('call_block_all') && is_array($_SESSION['user']['extension'] && count($_SESSION['user']['extension']) > 0)) {
 		$sql .= "and extension_uuid in (";
 		$x = 0;
 		foreach ($_SESSION['user']['extension'] as $field) {
@@ -131,7 +131,7 @@
 //get the list
 	$sql = "select * from view_call_block ";
 	$sql .= "where domain_uuid = :domain_uuid ";
-	if (!permission_exists('call_block_all') && count($_SESSION['user']['extension']) > 0) {
+	if (!permission_exists('call_block_all') && is_array($_SESSION['user']['extension'] && count($_SESSION['user']['extension']) > 0)) {
 		$sql .= "and extension_uuid in (";
 		$x = 0;
 		foreach ($_SESSION['user']['extension'] as $field) {