CreateSymlinksToUtils() used twice in airtime-upgrade.php

When upgrading from 1.8.2 deb package to the 1.9.1 test .deb package I get the error:

******************************** Update Begin *********************************
PHP Fatal error: Cannot redeclare AirtimeInstall::CreateSymlinksToUtils() in /var/lib/airtime/install_minimal/upgrades/airtime-1.9.0/airtime-upgrade.php on line 49

It does seem to be declared already on line 25 for a similar function but with different content:

     public static function CreateSymlinksToUtils()
    {
        echo "* Installing airtime-user".PHP_EOL;
        $dir = AirtimeInstall::CONF_DIR_BINARIES."/utils/airtime-user";
        exec("ln -s $dir /usr/bin/airtime-user");
    }