PHP Notice in extractPluralCount function

[Emanuel Bronshtein]

Run:

include 'vendor/autoload.php';
$loader = new PhpMyAdmin\MoTranslator\Translator('test.mo');
$loader->extractPluralCount('nplurals');

result:

PHP Notice:  Undefined offset: 1 in .../vendor/phpmyadmin/motranslator/src/Translator.php on line 200