메세지에는 치명적 오류 발생이라고 되어 있는데 어떻게 해결하면 될까요?

https://benetme.com/event/

https://imgur.com/a/e7B3fMx

요류내용

2021-06-02T02:51:40+00:00 CRITICAL Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/class/KBContent.class.php:626
Stack trace:
#0 /var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/class/KBContent.class.php(626): in_array()
#1 /var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/class/KBoardBuilder.class.php(516): KBContent->increaseView()
#2 /var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/class/KBoardBuilder.class.php(312): KBoardBuilder->builderDocument()
#3 /var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/index.php(808): KBoardBuilder->create()
#4 /var/www/vhosts/benetme.com/httpdocs/wp-includes/shortcodes.php(343): kboard_builder()
#5 [internal function]: do_shortcode_tag()
#6 /var/www/vhosts/benetme.com/httpdocs/wp-includes/shortcodes.php(218): preg_replace_callback()
#7 /var/www/vhosts/benetme.com/httpdocs/wp-includes/class-wp-hook.php(292): do_shortcode()
#8 /var/www/vhosts/benetme.com/httpdocs/wp-includes/plugin.php(212): WP_Hook->apply_filters()
#9 /var/www/vhosts/benetme.com/httpdocs/wp-includes/post-template.php(253): apply_filters()
#10 /var/www/vhosts/benetme.com/httpdocs/wp-content/themes/sober/template-parts/content-page.php(21): the_content()
#11 /var/www/vhosts/benetme.com/httpdocs/wp-includes/template.php(732): require('...')
#12 /var/www/vhosts/benetme.com/httpdocs/wp-includes/template.php(676): load_template()
#13 /var/www/vhosts/benetme.com/httpdocs/wp-includes/general-template.php(204): locate_template()
#14 /var/www/vhosts/benetme.com/httpdocs/wp-content/themes/sober/page.php(23): get_template_part()
#15 /var/www/vhosts/benetme.com/httpdocs/wp-includes/template-loader.php(106): include('...')
#16 /var/www/vhosts/benetme.com/httpdocs/wp-blog-header.php(19): require_once('...')
#17 /var/www/vhosts/benetme.com/httpdocs/index.php(17): require('...')
#18 {main}
  thrown(/var/www/vhosts/benetme.com/httpdocs/wp-content/plugins/kboard/class/KBContent.class.php, ?~D 626)