Stripe plugin error with PHP version 7.4

Hi there
I’ve updated my php version to 7.4 and now I’m getting errors with the stripe plugin.
It does not save settings automatically and when I change any setting it goes back to default.

When putting wordpress into debug mode I get this error:

Fatal error: Uncaught Error: Call to a member function values() on string in /home/admin/web/rolescape.online/public_html/wp-content/plugins/dopbsp-stripe/includes/class-stripe-update.php:61 Stack trace: #0 /home/admin/web/rolescape.online/public_html/wp-includes/class-wp-hook.php(292): DOPBSPStripeUpdate->update() #1 /home/admin/web/rolescape.online/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #2 /home/admin/web/rolescape.online/public_html/wp-includes/plugin.php(484): WP_Hook->do_action() #3 /home/admin/web/rolescape.online/public_html/wp-settings.php(560): do_action() #4 /home/admin/web/rolescape.online/public_html/wp-config.php(90): require_once('/home/admin/web...') #5 /home/admin/web/rolescape.online/public_html/wp-load.php(37): require_once('/home/admin/web...') #6 /home/admin/web/rolescape.online/public_html/wp-admin/admin.php(34): require_once('/home/admin/web...') #7 /home/admin/web/rolescape.online/public_html/wp-admin/plugins.php(10): require_once('/home/admin/web...') #8 {main} t in /home/admin/web/rolescape.online/public_html/wp-content/plugins/dopbsp-stripe/includes/class-stripe-update.php on line 61

my server details are:

SO: Linux
Server: Apache/2.4.25 (Debian) mod_fcgid/2.3.9 OpenSSL/1.0.2u
Hostname: rolescape.online
IP: 51.178.139.48:443
/home/admin/web/rolescape.online/public_html

PHP

v7.4.14
GD: 2.2.5
Límite de memoria: 132,0 MiB
Tiempo máximo de ejecución de un script: 320s
Tama?o máximo de envío: 118,0 MiB
Máximo tama?o de subida: 310,0 MiB
MYSQL

v10.1.47-MariaDB-0+deb9u1
Número máximo de conexiones: 70
Tama?o máximo de paquete: 16,0 MiB
Uso del disco por datos: 4,1 MiB
Uso del disco por índices: 2,8 MiB`

Any clue of what might be the problem? I would rather fix this than change the PHP version as I have other websites running on the same server

Thanks for your support anything I can do, please let me know