카페24 를 이용하지 않고 제 컴에서 연습중입니다.  어떤 설정이 문제일까요?

Fatal error: Uncaught TypeError: abs(): Argument #1 ($num) must be of type int|float, string given in C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBAdminController.class.php:173 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBAdminController.class.php(173): abs('') #1 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(287): KBAdminController->update('') #2 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters('', Array) #3 C:\xampp\htdocs\wordpress\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #4 C:\xampp\htdocs\wordpress\wp-admin\admin-post.php(70): do_action('admin_post_kboa...') #5 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBAdminController.class.php on line 173

이 웹사이트에 치명적인 오류가 있습니다. 지침을 위해 사이트 관리자 이메일의 받은 편지함을 확인

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게시판도 작성까지는 되는데 목록을 다시 클릭하면 

Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBContent.class.php:617 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBContent.class.php(617): in_array('1', NULL) #1 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBoardBuilder.class.php(516): KBContent->increaseView() #2 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBoardBuilder.class.php(305): KBoardBuilder->builderDocument() #3 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\index.php(794): KBoardBuilder->create() #4 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\template\board.php(31): kboard_builder(Array) #5 C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBTemplate.class.php(55): include_once('C:\\xampp\\htdocs...') #6 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(287): KBTemplate->board('') #7 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #8 C:\xampp\htdocs\wordpress\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #9 C:\xampp\htdocs\wordpress\wp-includes\template-loader.php(13): do_action('template_redire...') #10 C:\xampp\htdocs\wordpress\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') #11 C:\xampp\htdocs\wordpress\index.php(17): require('C:\\xampp\\htdocs...') #12 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\kboard\class\KBContent.class.php on line 617

이런 에러가 발생합니다. 해당 라인을 보면 공란입니다.

도움 부탁합니다,