Fix LDAP Query does not continue all users if the user already exists in the system with the same email address

It worked perfectly

In my situation, the patch wasn't working effectively when a user logged in and another user had the same email but a different username. I discovered that the patch was checking if the logged-in user had the same username, which always triggered the error message: 'Another user already exists in the system with the same email address. You should contact the system administrator to resolve this conflict.'

To resolve this, I modified the code to remove the username check, tested it, and found that it works fine