Snapshot Restoration Issue

When restoring Snapshot, it's giving an error on console and stops going further. No error is showing in the browser window. The following error is shown:

snapshot_restore.js:325 Uncaught TypeError: Cannot read property 'errorStatus' of null
at Object.success (snapshot_restore.js:325)
at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=4.9.1:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=4.9.1:2)
at y (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=4.9.1:4)
at XMLHttpRequest.c (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=4.9.1:4)

I've asked the user to create a new snapshot, then import and restore. Exactly the same issue even with the new snapshot backup.

I downloaded the backup and tried to restore on my test site, it gave me the following error in the browser window:

"An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings."