CRITICAL Uncaught TypeError: Cannot access offset of type string on string in /var/www/html/wp-content/plugins/btcpay-for-woocommerce/class-wc-gateway-btcpay.php:499

[webyacusa]

I installed the BTCPay plugging on my ubuntu 20.04 server. It has PHP 8.0.11 and Apache 2. The installation completes successfully. When I try to go to WooCommerce -> Settings -> Payments and I select the setup button next to BTCPay, the configuration screen does not shows any of the options that usually does:

** Woocommerce System Status **

WooCommerce Plugin Logs (if applicable)

2022-01-02T05:03:20+00:00 CRITICAL Uncaught TypeError: Cannot access offset of type string on string in /var/www/html/wp-content/plugins/btcpay-for-woocommerce/class-wc-gateway-btcpay.php:499
Stack trace:
#0 /var/www/html/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-settings-api.php(329): WC_Gateway_BtcPay->generate_order_states_html()
#1 /var/www/html/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-settings-api.php(85): WC_Settings_API->generate_settings_html()
#2 /var/www/html/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-payment-gateway.php(194): WC_Settings_API->admin_options()
#3 /var/www/html/wp-content/plugins/woocommerce/includes/admin/settings/class-wc-settings-payment-gateways.php(104): WC_Payment_Gateway->admin_options()
#4 /var/www/html/wp-content/plugins/woocommerce/includes/admin/settings/class-wc-settings-payment-gateways.php(87): WC_Settings_Payment_Gateways->run_gateway_admin_options()
#5 /var/www/html/wp-includes/class-wp-hook.php(303): WC_Settings_Payment_Gateways->output()
#6 /var/www/html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters()
#7 /var/www/html/wp-includes/plugin.php(470): WP_Hook->do_action()
#8 /var/www/html/wp-content/plugins/woocommerce/includes/admin/views/html-admin-settings.php(40): do_action()
#9 /var/www/html/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-settings.php(153): include('...')
#10 /var/www/html/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-menus.php(273): WC_Admin_Settings::output()
#11 /var/www/html/wp-includes/class-wp-hook.php(303): WC_Admin_Menus->settings_page()
#12 /var/www/html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters()
#13 /var/www/html/wp-includes/plugin.php(470): WP_Hook->do_action()
#14 /var/www/html/wp-admin/admin.php(259): do_action()
#15 {main}
thrown in /var/www/html/wp-content/plugins/btcpay-for-woocommerce/class-wc-gateway-btcpay.php on line 499

Your BTCPay Environment (please complete the following information):

• BTCPay Server Version: v1.3.7.0 (Although this info is irrelevant since I can't enter the server info yet on the configuration
• Deployment Method: Digital Ocean Droplet
• Browser: Chrome, Firefox

Additional context

Screenshots / Video / GIf (if applicable)

[NicolasDorier]

First time I see this. Can you try to tweak the code in the line class-wc-gateway-btcpay.php:499, to see more about what is going on?

I guess something having to do with the order states in your install.