Error on creating unique user ID when registering anonymously

I’m using a registration form for a file-submission database.
To enable posting multiple times for the same username/email, I’m not using the build in user/email fields, but instead creating custom meta-keys.

UM then creates a Unique email/user id, and heres where i found a small bug.

When testing for a unique username, UM counts the current number of users (line 326 in includes/core/um-actions-register.php) and ads 1.

But if you delete one existing user, you may get a username that already exists, resulting in an error creating the user.

I fixed this, by modifying line 328 – 330 in includes/core/um-actions-register.php from:

	if ( ! isset( $user_login ) ||  strlen( $user_login ) > 30 && ! is_email( $user_login ) ) {
		$user_login = 'user' . $unique_userID;
	}

to

	if ( ! isset( $user_login ) ||  strlen( $user_login ) > 30 && ! is_email( $user_login ) ) {
		$user_login = 'user' . $unique_userID;
		
		$temp_user_login = $user_login;
		
		while ( username_exists( $temp_user_login ) ) {
			$temp_user_login = 'user' . $unique_userID;
			$unique_userID++;
		}
		if ( $temp_user_login !== $user_login ) {
			$user_login = $temp_user_login;
		}
		
		
	}

Would be nice to have implemented in an update.