PHP 8 Error

On PHP 8 and WordPress 5.8 getting this error:

[Fri Jul 23 17:57:50.503561 2021] [php:error] [pid 5228:tid 1904] [client ::1:61305] PHP Fatal error: Uncaught Error: Undefined constant "DEFAULT_SUFFIX" in C:\\xampppp\\htdocs\\wp-content\\plugins\\statify-widget\\statify-widget.php:142\nStack trace:\n#0 C:\\xampppp\\htdocs\\wp-includes\\widgets.php(1224): StatifyWidget->widget(Array, Array)\n#1 C:\\xampppp\\htdocs\\wp-includes\\rest-api\\endpoints\\class-wp-rest-widget-types-controller.php(520): the_widget('StatifyWidget', Array)\n#2 C:\\xampppp\\htdocs\\wp-includes\\rest-api\\endpoints\\class-wp-rest-widget-types-controller.php(490): WP_REST_Widget_Types_Controller->get_widget_preview('StatifyWidget', Array)\n#3 C:\\xampppp\\htdocs\\wp-includes\\rest-api\\class-wp-rest-server.php(1140): WP_REST_Widget_Types_Controller->encode_form_data(Object(WP_REST_Request))\n#4 C:\\xampppp\\htdocs\\wp-includes\\rest-api\\class-wp-rest-server.php(987): WP_REST_Server->respond_to_request(Object(WP_REST_Request), '/wp/v2/widget-t...', Array, NULL)\n#5 C:\\xampppp\\htdocs\\wp-includes\\rest-api\\class-wp-rest-server.php(414): WP_REST_Server->dispatch(Object(WP_REST_Request))\n#6 C:\\xampppp\\htdocs\\wp-includes\\rest-api.php(370): WP_REST_Server->serve_request('/wp/v2/widget-t...')\n#7 C:\\xampppp\\htdocs\\wp-includes\\class-wp-hook.php(303): rest_api_loaded(Object(WP))\n#8 C:\\xampppp\\htdocs\\wp-includes\\class-wp-hook.php(327): WP_Hook->apply_filters('', Array)\n#9 C:\\xampppp\\htdocs\\wp-includes\\plugin.php(518): WP_Hook->do_action(Array)\n#10 C:\\xampppp\\htdocs\\wp-includes\\class-wp.php(388): do_action_ref_array('parse_request', Array)\n#11 C:\\xampppp\\htdocs\\wp-includes\\class-wp.php(750): WP->parse_request('')\n#12 C:\\xampppp\\htdocs\\wp-includes\\functions.php(1291): WP->main('')\n#13 C:\\xampppp\\htdocs\\wp-blog-header.php(16): wp()\n#14 C:\\xampppp\\htdocs\\index.php(17): require('C:\\\\xampppp\\\\htdo...')\n#15 {main}\n thrown in C:\\xampppp\\htdocs\\wp-content\\plugins\\statify-widget\\statify-widget.php on line 142, referer: http://localhost/wp-admin/widgets.php