After a long check, it seems that this is caused by a Youtube block which contains
https://www.youtube.com/watch?v=ZAgCi9Ltjes&t=125s video due to the double quote in its title.
I had applied a temporary fix at
JoomlaFolder/administrator/components/com_easyblog/includes/blocks/handlers/youtube.php and it should be working fine now.
Can you try again and see how it goes?
I am able to replicate this on my local site as well.
I will log this into our issue tracker.