Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /var/www/ianring.com/vendor/ianring/php-music-tools/src/PHPMusicTools/classes/Scale.php:550 Stack trace: #0 /var/www/ianring.com/vendor/ianring/php-music-tools/src/PHPMusicTools/classes/Scale.php(550): array_key_exists() #1 /var/www/ianring.com/public_html/musictheory/scales/scale.php(30): ianring\Scale->name() #2 {main} thrown in /var/www/ianring.com/vendor/ianring/php-music-tools/src/PHPMusicTools/classes/Scale.php on line 550