Warning: Missing argument 2 for Incsub_Support_Query::set_wp_title() in /home/letusbey/pu

Just installed this plugin and we are seeing
<b>Warning</b>: Missing argument 2 for Incsub_Support_Query::set_wp_title() in <b>/home/letusbey/public_html/support/wp-content/plugins/incsub-support/inc/classes/class-query.php</b> on line <b>144</b>

In the title. See Source code