Getting undefiined errors

b>Notice</b>: Undefined index: gfl in <b>/public_html/wp-content/plugins/wp-head-section-cleaner/includes/do-functions.php</b> on line <b>5</b>

<b>Notice</b>: Undefined variable: alk in <b>/public_html/wp-content/plugins/wp-head-section-cleaner/includes/do-functions.php</b> on line <b>44</b>

https://ww.wp.xz.cn/plugins/wp-head-section-cleaner/