Notice on responsive_menu.menu.inc

Dear all,

Thank you for this fantastic module, I've been using it since the beginning in several projects. With php 7.4 I'm having a notice:
Notice: Trying to access array offset on value of type bool in responsive_menu_tree_output() (line 107 of /home/.../public_html/sites/all/modules/responsive_menu/includes/responsive_menu.menu.inc).

Is there a fix? Will this module work with php 8?