PHP Warning

PHP Warning

Hello and thank you once again for such an amazing plugin.
I'm having an error that keeps repeating in my error-log of joomla. I'm on Joomla 4 and php 8
[04-Nov-2022 11:39:28 UTC] PHP Warning:  Undefined array key "HTTP_ACCEPT" in /root/website/plugins/system/djimgtowebp/helper.php on line 29
[04-Nov-2022 11:54:55 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /root/website/plugins/system/djimgtowebp/helper.php on line 7
Is there any way i can fix or stop this error?

Kind regards