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@luciamarinescu, I checked error log and saw the description:

feedlot.ru [Thu Oct 21 23:50:51 2021] [php7:error] [pid 69510] [client 217.172.18.156:0] PHP Fatal error: Uncaught PhpOffice\\PhpSpreadsheet\\Exception: Maximum 31 characters allowed in sheet title. in /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php:470\nStack trace:\n#0 /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php(855): PhpOffice\\PhpSpreadsheet\\Worksheet\\Worksheet::checkSheetTitle('%d0%b8%d0%bc%d0...')\n#1 /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/classes/Visualizer/Module.php(340): PhpOffice\\PhpSpreadsheet\\Worksheet\\Worksheet->setTitle('%d0%b8%d0%bc%d0...')\n#2 /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/classes/Visualizer/Module.php(246): Visualizer_Module->_getExcel(Array, '\\xD0\\x98\\xD0\\xBC\\xD0\\xBF\\xD0\\xBE\\xD1\\x80\\xD1\\x82 \\xD0\\xB2...')\n#3 /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/classes/Visualizer/Module/Frontend.php(211): Visualizer_Module->_getDataAs(16443, 'xls')\n#4 /home/p/pkanard in /home/p/pkanardovg/public_html/wp-content/plugins/visualizer/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php on line 470, referer: https://feedlot.ru/category/market-dynamics/va1000/

The problem is in sheet title. If I make a cyrillic sheet title (Объем импорта витамина А1000 в Россию), then I become this error.
Sheet title in English works well: http://joxi.ru/52aJp55sEoaZ6A.
Looks strange because the top chart with cyrillic sheet title works normally: http://joxi.ru/823gY99h9Lb462.