Cyrillic does not work

At first I got an error. Now for the place of Russian letters is displayed ?

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Warning: count(): Parameter must be an array or an object that implements Countable in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/php-svg-lib/src/Svg/Document.php on line 259

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 14680160 bytes) in /home/c36896/2980000.ru/www/wp-content/plugins/pdf-catalog-woocommerce/dompdf-master/lib/Cpdf.php on line 6408

The page I need help with: [log in to see the link]