Symfony 2 & amp; Панель инструментов отладки sonata admin сломана, не выполнена, и отображается пустым

Иногда я нажимаю (symfony2 & бэкэнд я использую sonata admin) на панели инструментов отладки кнопка отображается пустым:
ничего не отображать (проверьте изображение здесь)

Вот источник Firefox, он здесь сломан (в теге svg):

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В теге SVG (проверьте изображение здесь)

Это меня запутало надолго. Кто может сказать мне, почему?

0

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