Content timeline block doesn’t work

When I try to add the content timeline block the page editor crashes and I can’t use it. It happens only when I try to use that block. Also, I can’t reach anyone through support email or contact form on the website. Everytime I send an email I get one back saying that the message can’t be delivered. If someone could try it on their website and tell if it’s crashing for them or just for me would also help. Thanks in advance.