Chyba XML feed Heureka

Dobry den,
po na?tení kategorií Heureka.cz se mi nezobrazuje ?ádny obsah (kromě menu) a wordpress hlásí chybu:
WordPress zaznamenal chybu v jednom z pou?ívanych plugin? – WPify Woo.

Nejprve nav?tivte web (https://avisvs.cz/) a zkontrolujte, zda neobsahuje nějaké chyby. Poté nav?tivte stránku, na které byla chyba zaznamenána (https://avisvs.cz/wp-admin/admin.php?page=wc-settings&tab=wpify-woo-settings&section=xml_feed_heureka&wpify-woo-action=update-heureka-categories) a opět zkontrolujte zda-li obsahuje nějaké chyby.

Konzole:

TypeError: t.find is not a function
    at fu (settings.js?ver=0b0bcd9a5aff14277214db5329c28b6d:2)
    at we (react-dom.min.js?ver=16.13.1:84)
    at zj (react-dom.min.js?ver=16.13.1:226)
    at Th (react-dom.min.js?ver=16.13.1:152)
    at tj (react-dom.min.js?ver=16.13.1:152)
    at Te (react-dom.min.js?ver=16.13.1:146)
    at Ja (react-dom.min.js?ver=16.13.1:224)
    at md (react-dom.min.js?ver=16.13.1:173)
    at react-dom.min.js?ver=16.13.1:175
    at Rh (react-dom.min.js?ver=16.13.1:147)
Me @ react-dom.min.js?ver=16.13.1:125
react-dom.min.js?ver=16.13.1:161 Uncaught TypeError: t.find is not a function
    at fu (settings.js?ver=0b0bcd9a5aff14277214db5329c28b6d:2)
    at we (react-dom.min.js?ver=16.13.1:84)
    at zj (react-dom.min.js?ver=16.13.1:226)
    at Th (react-dom.min.js?ver=16.13.1:152)
    at tj (react-dom.min.js?ver=16.13.1:152)
    at Te (react-dom.min.js?ver=16.13.1:146)
    at Ja (react-dom.min.js?ver=16.13.1:224)
    at md (react-dom.min.js?ver=16.13.1:173)
    at react-dom.min.js?ver=16.13.1:175
    at Rh (react-dom.min.js?ver=16.13.1:147)
admin.php?page=wc-settings&tab=wpify-woo-settings&section=xml_feed_heureka:1 Failed to load resource: the server responded with a status of 500 (Internal Server Error)

Děkuji moc za pomoc