Fixing MODX Revolution Errors on php v.5.4.13

While deploying MODX Revolution on a server with php v.5.4.13 I ran into a broken admin panel and search.

In the apache log I found the following error:

PHP Fatal error: Call to a member function setCacheable() on a non-object in core/cache/includes/elements/modsnippet/31.include.cache.php on line 31

Searching the internets didn’t get me anywhere. Everyone suggests reinstalling ModX, clearing the core/cache folder, and so on.

Needless to say, none of that advice helps.

To fix it, you need to wrap $tpl->setCacheable(false); in a conditional, like this:

if (is_object($tpl)) {
  $tpl->setCacheable(false);
}

The same approach fixes the following nasty one:

PHP Fatal error: Call to a member function get() on a non-object in core/model/modx/modmanagerresponse.class.php on line 41

if (is_object($action)){
  $action = $action->get('id');
}