Multiple Errors in Ban Hammer plugin page…

Using new, clean copy of WP 4, with ONLY this plugin ever activated.

USING Current WAMP with PHP 5.3.10

Get errors in default theme, with these errors when wp-config.php is configured for WP_DEB is set to true:

( ! ) Notice: Use of undefined constant banhammer – assumed ‘banhammer’ in C:\wamp\www\website\wp-content\plugins\ban-hammer\ban-hammer.php on line 273

( ! ) Notice: Use of undefined constant banhammer – assumed ‘banhammer’ in C:\wamp\www\website\wp-content\plugins\ban-hammer\ban-hammer.php on line 274

( ! ) Notice: Use of undefined constant banhammer – assumed ‘banhammer’ in C:\wamp\www\website\wp-content\plugins\ban-hammer\ban-hammer.php on line 280

( ! ) Notice: Use of undefined constant banhammer – assumed ‘banhammer’ in C:\wamp\www\website\wp-content\plugins\ban-hammer\ban-hammer.php on line 281

https://ww.wp.xz.cn/plugins/ban-hammer/