Notice: Undefined variable: wpa_domain in /wp-content/plugins/aws-cdn-by-wpadmin

Hello Dev,
Thank you for your wonderful plugin. Till date(not correct day known) the plugin was working fine but today I was checking my website and found that it has following notices which has filled the whole page and due to these notices my whole site goes down and shown incorrectly and messed up.
The notice is:
Notice: Undefined variable: wpa_domain in /wp-content/plugins/aws-cdn-by-wpadmin/aws-cdn.php on line 640

My website is www_hd100_in(Pl replace _ with .)

I have temporarily disabled and enabled but that doesn’t help. So I will disable my CDN untill I will recieve your reply / a fix.

Screen shot attached at:

View post on imgur.com

Please note your this plugin works very fine on my other website.