To fix yourself, update /app/controllers/admin_clients.php
Assuming you are running v3.1.3, find line 3472:
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if (!empty($this->post)) {
$this->Services->edit($service->id, $this->post, false, (isset($this->post['notify_order']) && $this->post['notify_order'] == "true"));
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and change it to:
------------
if (!empty($this->post)) {
if (!isset($this->post['use_module']))
$this->post['use_module'] = "false";
$this->Services->edit($service->id, $this->post, false, (isset($this->post['notify_order']) && $this->post['notify_order'] == "true"));
------------
To fix yourself, update /app/controllers/admin_clients.php
Assuming you are running v3.1.3, find line 3472:
-------------
if (!empty($this->post)) {
$this->Services->edit($service->id, $this->post, false, (isset($this->post['notify_order']) && $this->post['notify_order'] == "true"));
------------
and change it to:
------------
if (!empty($this->post)) {
if (!isset($this->post['use_module']))
$this->post['use_module'] = "false";
$this->Services->edit($service->id, $this->post, false, (isset($this->post['notify_order']) && $this->post['notify_order'] == "true"));
------------