"Customize" content disappeared after migrating to live server

Hello,

it’s not my first time migrating wp from localhost to a server, but the first time this happened. I edited all the information locally through “Customize”, added some custom css, added a few posts in admin panel.

When I migrated to a live server my posts are on their place and links are working (so I guess it’s not a database problem?), but all the changes I made through “Customize” does not work. Even if I try to edit something on the live server through “Customize” it shows error that something gone wrong, try reload Your page.

I think maybe it has something to do with “child” theme? How can I manage this? Would appreciate any ideas or help. Thanks in advance!