Php8 upgrade causes a conflict with the Woocommerce PDF voucher plugin

Our hosting service is retiring php7.4 in January so a resolution is quite urgent.

After upgrading to php8, the wpforo plugin causes the woocomerce PDF voucher plugin to break. I have disabled wpforo and it works fine. When I revert back to php7.4 both plugins work as expected. This is the error:

2022-11-21T21:04:21+00:00 CRITICAL Uncaught TypeError: property_exists(): Argument #1 ($object_or_class) must be of type object|string, null given in .../wp-content/plugins/wpforo/includes/functions.php:2911
Stack trace:
#0 .../wp-content/plugins/wpforo/includes/functions.php(2911): property_exists(NULL, 'components')
#1 .../wp-content/plugins/wpforo/includes/functions-template.php(106): wpforo_setting('components', 'page_title')
#2 .../wp-includes/class-wp-hook.php(308): wpforo_hide_title('An awesome title', 134120)
#3 .../wp-includes/plugin.php(205): WP_Hook->apply_filters('An awesome title', Array)
#4 .../wp-includes/post-template.php(173): apply_filters('the_title', 'An awesome title', 134120)
#5 .../wp-content/plugins/woocommerce-pdf-product-vouchers/includes/customizer/class-wc-pdf-product-vouchers-customizer.php(638): get_the_title(Object(WP_Post))

…..

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### WordPress Environment ###

WordPress address (URL): —
Site address (URL): —
WC Version: 7.1.0
REST API Version: ? 7.1.0
WC Blocks Version: ? 8.7.5
Action Scheduler Version: ? 3.5.2
Log Directory Writable: ?
WP Version: 6.1.1
WP Multisite: –
WP Memory Limit: 512 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US
External object cache: –

### Server Environment ###

Server Info: nginx/1.21.3
PHP Version: 7.4.33
PHP Post Max Size: 128 MB
PHP Time Limit: 300
PHP Max Input Vars: 10000
cURL Version: 7.68.0
OpenSSL/1.1.1f

SUHOSIN Installed: –
MySQL Version: 5.5.5-10.3.34-MariaDB-0ubuntu0.20.04.1
Max Upload Size: 128 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 7.1.0

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (48) ###

WooCommerce PDF Product Vouchers: by SkyVerge – 3.8.0
wpForo: by gVectors Team – 2.1.1