Steps to reproduce the issue

Enter the url
Enter the correct username
Enter the correct password
Click on Log in button : Nothing happens/ does not login (nothing in console)
Click on Log in button Again

Shows error in console:
index.php:1 Uncaught SyntaxError: Unexpected token < in JSON at position 0
at JSON.parse ()
at onSuccess (admin-login.min.js?b65d31df5863825298b9f8dbb4cc7745:1)
at XMLHttpRequest.c.onreadystatechange (core.min.js?b65d31df5863825298b9f8dbb4cc7745:1)

Expected result

Should log in successfully

Actual result

Shows error
index.php:1 Uncaught SyntaxError: Unexpected token < in JSON at position 0
at JSON.parse ()
at onSuccess (admin-login.min.js?b65d31df5863825298b9f8dbb4cc7745:1)
at XMLHttpRequest.c.onreadystatechange (core.min.js?b65d31df5863825298b9f8dbb4cc7745:1)

System information (as much as possible)

joomla4
php73

Additional comments