Warning: htmlspecialchars(): Invalid multibyte sequence in argument in piwik/vendor/twig/twig/lib/Twig/Extension/Core.php #5157

Reported in the forums

We have experienced this problem before: #3259, #3816, #3859, #4221, #4330, #4974.

So my approach to fixing this bug has failed to fix it across all occurrences.

Maybe there is a better approach (such as making twig fail silently in case of such errors?)