Preciso ativar um plugin Integra??o Pipedrive CF7 mas quando eu ativo o plugin dá esse erro na página.

Fatal error: Uncaught Error: Call to a member function get() on null in /home/storage/b/68/16/fortfrio/public_html/wp-includes/query.php:28 Stack trace: #0 /home/storage/b/68/16/fortfrio/public_html/wp-content/plugins/monk/includes/monk-functions.php(353): get_query_var(‘lang’, ‘pt_PT’) #1 /home/storage/b/68/16/fortfrio/public_html/wp-content/plugins/monk/public/class-monk-public.php(285): monk_translated_post_id(‘205’) #2 /home/storage/b/68/16/fortfrio/public_html/wp-includes/class-wp-hook.php(288): Monk_Public->monk_page_on_front_translations(‘205’) #3 /home/storage/b/68/16/fortfrio/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(‘205’, Array) #4 /home/storage/b/68/16/fortfrio/public_html/wp-includes/option.php(148): apply_filters(‘option_page_on_…’, ‘205’, ‘page_on_front’) #5 /home/storage/b/68/16/fortfrio/public_html/wp-includes/class-wp-query.php(915): get_option(‘page_on_front’) #6 /home/storage/b/68/16/fortfrio/public_html/wp-includes/class-wp-query.php(1621): WP_Query->parse_query() #7 /home/stor in /home/storage/b/68/16/fortfrio/public_html/wp-includes/query.php on line 28

Quando seleciono um outro idioma no site n?o está carregando corretamente o arquivo de tradu??o do tema e as strings continuam exibindo o texto do idioma principal do site.