Frontend error on single event page

Hello,

I upgraded it with 4.6.5 today.
Google Recaptcha is disabled, but still there is an error on single event page:

https://prntscr.com/pakgun

and here is the json file exported from our setting:

{"settings":{"hide_time_method":"end","multiple_day_show_method":"all_days","remove_data_on_uninstall":"0","date_suffix":"0","weekdays":["1","2","3","4","5"],"weekends":["6","7"],"archive_title":"Events","default_skin_archive":"full_calendar","custom_archive":"","monthly_view_archive_skin":"classic","timetable_archive_skin":"modern","list_archive_skin":"classic","grid_archive_skin":"classic","default_skin_category":"list","monthly_view_category_skin":"classic","timetable_category_skin":"modern","list_category_skin":"classic","grid_category_skin":"classic","category_events_method":"1","archive_status":"1","slug":"events","category_slug":"mec-category","single_date_format1":"M d Y","single_date_method":"next","single_single_style":"default","single_booking_style":"default","gutenberg":"0","breadcrumbs":"0","currency":"$","currency_symptom":"","currency_sign":"before","thousand_separator":",","decimal_separator":".","decimal_separator_status":"1","speakers_status":"0","google_recaptcha_status":"0","google_recaptcha_booking":"0","google_recaptcha_fes":"0","google_recaptcha_sitekey":"","google_recaptcha_secretkey":"","export_module_status":"1","sn":{"googlecal":"1","ical":"1","facebook":"0","twitter":"0","linkedin":"1","vk":"0","email":"1"},"local_time_module_status":"1","countdown_status":"1","countdown_list":"flip","social_network_status":"1","next_event_module_status":"1","next_event_module_method":"event","next_event_module_date_format1":"M d Y","time_format":"12","fes_list_page":"51211","fes_form_page":"51213","fes_guest_status":"0","fes_guest_name_email":"0","fes_section_event_links":"0","fes_section_cost":"0","fes_section_featured_image":"1","fes_section_categories":"1","fes_section_labels":"1","fes_section_event_color":"1","fes_section_tags":"1","fes_section_location":"0","fes_section_organizer":"0","fes_section_speaker":"0","fes_section_hourly_schedule":"0","fes_section_booking":"0","fes_section_fees":"0","fes_section_ticket_variations":"0","fes_note":"0","fes_note_visibility":"always","exceptional_days":"1","additional_organizers":"0","additional_locations":"0","bp_status":"0","bp_attendees_module":"0","bp_attendees_module_limit":"9999","bp_add_activity":"0","mchimp_status":"0","mchimp_api_key":"","mchimp_list_id":"","mchimp_subscription_status":"subscribed","upload_field_mime_types":"","upload_field_max_upload_size":"10","schema":"1","search_bar_ajax_mode":"1","search_bar_modern_type":"1","search_bar_category":"1","search_bar_location":"0","search_bar_organizer":"0","search_bar_tag":"1","search_bar_label":"1","search_bar_text_field":"1","related_events":"1","related_events_basedon_category":"1","related_events_basedon_organizer":"0","related_events_basedon_location":"0","related_events_basedon_label":"1","related_events_basedon_tag":"1"},"styles":{"CSS":""},"gateways":{"1":{"status":1}},"notifications":{"booking_notification":{"subject":"Your booking is received.","recipients":"","content":"Hello %%name%%,\r\n\r\n Your booking is received. We will check and confirm your booking as soon as possible.\r\n Thanks for your patience.\r\n\r\n Regards,\r\n %%blog_name%%"},"email_verification":{"subject":"Please verify your booking.","recipients":"","content":"Hi %%name%%,\r\n\r\n Please verify your booking by clicking on following link:\r\n\r\n %%verification_link%%\r\n\r\n Regards,\r\n %%blog_name%%"},"booking_confirmation":{"subject":"Your booking is confirmed.","recipients":"","content":"Hi %%name%%,\r\n\r\n Your booking is confirmed. You should be available at %%book_date%% in %%event_location_address%%.\r\n\r\n You can contact to event organizer by calling %%event_organizer_tel%%.\r\n\r\n Regards,\r\n %%blog_name%%"},"admin_notification":{"subject":"A new booking is received.","recipients":"","content":"Dear Admin,\r\n\r\n A new booking is received. Please check and confirm it as soon as possible.\r\n\r\n %%admin_link%%\r\n \r\n %%attendees_full_info%%\r\n\r\n Regards,\r\n %%blog_name%%"},"new_event":{"status":"1","subject":"A new event is added.","recipients":"[email protected]","content":"Hello,\r\n\r\nA new event just added. The event title is %%event_title%% and its status is %%event_status%%.\r\nThe new event may need to be published. Please use this link for managing your website events: %%admin_link%%\r\n\r\nRegards,\r\n%%blog_name%%"},"cancellation_notification":{"status":"0","subject":"Your booking is canceled.","recipients":"","send_to_admin":"1","send_to_organizer":"0","send_to_user":"0","content":"Hi %%name%%,\r\n\r\n For your information, your booking for %%event_title%% at %%book_date%% is canceled.\r\n\r\n Regards,\r\n %%blog_name%%"},"user_event_publishing":{"status":"1","subject":"Your event gets published!","recipients":"","content":"Hello %%name%%,\r\n\r\nYour event gets published. You can check it below:\r\n\r\n\u003Ca href=\\\"%%event_link%%\\\"\u003E%%event_title%%\u003C\/a\u003E\r\n\r\nRegards,\r\n%%blog_name%%"}},"styling":{"color":"","title_color":"","title_color_hover":"","content_color":"","mec_h_fontfamily":"","mec_p_fontfamily":"","disable_gfonts":"0","container_normal_width":"","container_large_width":""}}