Themes ?Biker“ – Code correction after PHP update needed

Hallo Community,

since long time I use the themes ?Biker“ from cats_456 on my own qnap device. Few days ago QNAP updated PHP to version 8.
Afterwards my site did not start with error message:
ArgumentCountError thrown
Too few arguments to function WP_Widget::__construct(),
0 passed in /share/CACHEDEV1_DATA/Web/wordpress/wp-includes/class-wp-widget-factory.php
on line 62 and at least 2 expected
Debugging showed , that this error caused by the theme ?Biker“.
Now my question: Is herein someone, who would be able to fix the code, so that ?biker“ is able to run as well with PHP 8?
Would be great, because I love this themes , but have know glue about PHP-proamming.
Thanks and looking forward for your replies.
Manfred