Pixproof causes cache problems

[mlenagh]

When using WPSuperCache I get an error that seems to be related to PixProof. Here are the details:

WordPress version 5.6.2
Current theme: Novo (version 3.1.7)
Current plugin: PixProof (version 2.0.1) PHP version 7.4.15

Error Details

An error of type E_ERROR was caused in line 75 of the file D:\vHosts\lenagh.nl\httpdocs\wp-content\plugins\pixproof\includes\class-Pixproof.php. Error message: Uncaught Error: Call to a member function close() on null in D:\vHosts\lenagh.nl\httpdocs\wp-content\plugins\pixproof\includes\class-Pixproof.php:75
Stack trace:
#0 D:\vHosts\lenagh.nl\httpdocs\wp-content\plugins\pixproof\includes\class-Pixproof.php(44): Pixproof::check_setup()
#1 D:\vHosts\lenagh.nl\httpdocs\wp-includes\class-wp-hook.php(287): Pixproof->init()
#2 D:\vHosts\lenagh.nl\httpdocs\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters()
#3 D:\vHosts\lenagh.nl\httpdocs\wp-includes\plugin.php(484): WP_Hook->do_action()
#4 D:\vHosts\lenagh.nl\httpdocs\wp-settings.php(420): do_action()
#5 D:\vHosts\lenagh.nl\httpdocs\wp-config.php(79): require_once('D:\vHosts\lenag...')
#6 D:\vHosts\lenagh.nl\httpdocs\wp-load.php(37): require_once('D:\vHosts\lenag...')
#7 D:\vHosts\lenagh.nl\httpdocs\wp-admin\admin.php(34): require_once('D:\vHosts\lenag...')
#8 D:\vHosts\lenagh.nl\httpdocs\wp-admin\options-general.php(10): require_once('D:\vHosts\lenag...')
#9 {main}
thrown