[WP Smush Pro] Smush Pro update PHP warning

Hi,

I updated plugin Smush Pro from version 2.8.1 to 2.8.2 and there was a PHP warning:
Warning: fopen(/xy.com/web/plugins/wp-smush-pro/wp-smush.php): failed to open stream: No such file or directory in /xy.com/wp-includes/functions.php on line 4848
Warning: fread() expects parameter 1 to be resource, boolean given in /xy.com/wp-includes/functions.php on line 4851
Warning: fclose() expects parameter 1 to be resource, boolean given in /xy.com/wp-includes/functions.php on line 4854

How can I fix it?

Thanks,
Jiri