kboard에 글을 작성하고 나면 이런 오류코드가 뜨는데 어떻게 해결하나요?

Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\class\KBContent.class.php:617 Stack trace: #0 C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\class\KBContent.class.php(617): in_array('4', NULL) #1 C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\class\KBoardBuilder.class.php(516): KBContent->increaseView() #2 C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\class\KBoardBuilder.class.php(312): KBoardBuilder->builderDocument() #3 C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\index.php(794): KBoardBuilder->create() #4 C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\index.php(819): kboard_builder(Array) #5 C:\xampp\htdocs\900chicken\wp-includes\class-wp-hook.php(287): kboard_auto_builder('') #6 C:\xampp\htdocs\900chicken\wp-includes\plugin.php(212): WP_Hook->apply_filters('', Array) #7 C:\xampp\htdocs\900chicken\wp-includes\post-template.php(253): apply_filters('the_content', '') #8 C:\xampp\htdocs\900chicken\wp-content\themes\900chicken\page-store.php(9): the_content() #9 C:\xampp\htdocs\900chicken\wp-includes\template-loader.php(106): include('C:\\xampp\\htdocs...') #10 C:\xampp\htdocs\900chicken\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') #11 C:\xampp\htdocs\900chicken\index.php(17): require('C:\\xampp\\htdocs...') #12 {main} thrown in C:\xampp\htdocs\900chicken\wp-content\plugins\kboard\class\KBContent.class.php on line 617