What is causing a "Maximum function nesting level" error in Symfony 2.1 and Twig?

I have a project on Symfony 2.1. After updating composer components (Gedemo, Symfony core, Doctrine, Twig, etc..) I have the following error:

Fatal error: Maximum function nesting level of '100' reached, aborting! in /var/www/{path}/vendor/twig/twig/lib/Twig/Token.php on line 78

I have PHP 5.4. What can cause this error?