Steps to reproduce the issue

Create a contact, public & published, save, memorise id (1).
Create another contact, public & unpublished, save, memorise id (2).
Create another contact, registered & published, save, memorise id (3).
Create a menu item "list contacts in category", call it "contacts".
Navigate to http://mysite.com/contacts to see the list of contacts as public, you'll see just one contact (1).

Navigate to this contact (http://mysite.com/contacts/1-somename), all good.

Navigate to unpublished contact (http://mysite.com/contacts/2-somename), see 404 "Contact not found" error page. All good.

Navigate to registered contact (http://mysite.com/contacts/3-somename), see long error message with stack trace.

Expected result

404 or 403 Error page (error template based) saying "contact not found" or "not authorised"

Actual result

Normal page (not error template based) with just an error message:

Error

exception 'Exception' with message 'Contact not found' in C:\home\bgpa\j31\components\com_contact\models\contact.php:328 Stack trace: #0 C:\home\bgpa\j31\components\com_contact\models\contact.php(252): ContactModelContact->getContactQuery(28) #1 C:\home\bgpa\j31\libraries\legacy\view\legacy.php(401): ContactModelContact->getItem() #2 C:\home\bgpa\j31\components\com_contact\views\contact\view.html.php(66): JViewLegacy->get('Item') #3 C:\home\bgpa\j31\libraries\legacy\controller\legacy.php(690): ContactViewContact->display() #4 C:\home\bgpa\j31\components\com_contact\controller.php(42): JControllerLegacy->display(true, Array) #5 C:\home\bgpa\j31\libraries\legacy\controller\legacy.php(728): ContactController->display() #6 C:\home\bgpa\j31\components\com_contact\contact.php(15): JControllerLegacy->execute(NULL) #7 C:\home\bgpa\j31\libraries\cms\component\helper.php(391): require_once('C:\home\bgpa\j3...') #8 C:\home\bgpa\j31\libraries\cms\component\helper.php(371): JComponentHelper::executeComponent('C:\home\bgpa\j3...') #9 C:\home\bgpa\j31\libraries\cms\application\site.php(191): JComponentHelper::renderComponent('com_contact') #10 C:\home\bgpa\j31\libraries\cms\application\site.php(230): JApplicationSite->dispatch() #11 C:\home\bgpa\j31\libraries\cms\application\cms.php(252): JApplicationSite->doExecute() #12 C:\home\bgpa\j31\index.php(40): JApplicationCms->execute() #13 {main}

System information (as much as possible)

J3.4.1, SEF on, error reporting off (!!!)

Additional comments

Probably a clash of old and new ways of raising errors (JError vs Exception) in contact model.

adding this line in components/com_contact/models/contact.php @ line 257 fixes the situation:

else JError::raiseError(404, JText::_('COM_CONTACT_ERROR_CONTACT_NOT_FOUND'));