Twig errors with custom template on Chamilo upgrade

If you use Chamilo and decided to develop your own template, you might be faced with an issue while upgrading from Chamilo 1.11.2 (or below) to 1.11.4 (or above).

The issue will usually be reflected by either of these:

a white page an error message about Twig if you have xdebug installed and showing error messages, something like this: