Haha, not as nice as I hoped I'd spend my monday.
Yes, it crashes during the debugging session. If I don't debug the webserver still crashes, but not VS.
If it's any help, the crash occurs in Twig\Template::displayWithErrorHandling(array $context, array $blocks = []) in the try { $this->doDisplay($context, $blocks); }
block.
Somehow makes it even more impressive...