script_async_handles error

i’m getting an error like “Notice: Undefined index: script_async_handles in /home/geonoith/public_html/wp-content/plugins/header-footer/plugin.php on line 131”. At frontend and backend. I install last version of this plugin its working fine. but in this version i get an error.(though my all pages working ok)

https://wordpress.org/plugins/header-footer/