Getting a critical error on the "Multipliers" & "Per Product" tabs from our plugin.

[priyanka-tychesoftwares]

Describe the bug
Getting the below critical error on the "Multipliers" & "Per Product" tabs from our plugin.

To Reproduce
Steps to reproduce the behavior:
WordPress & WooCommerce version are latest.
PHP version 8.0.23 is present on the client site.

1. Go to the "Multipliers" & "Per Product" tabs of our plugin and you will get a message "There has been a critical error on this website. Please check your site admin email inbox for instructions." there.
2. This error is coming at WC -> Status -> Logs
   [21-Sep-2022 07:06:03 UTC] PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/price-by-user-role-for-woocommerce/includes/settings/class-alg-wc-price-by-user-role-settings-multipliers.php:84
   Stack trace:
   #0 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/price-by-user-role-for-woocommerce/includes/settings/class-alg-wc-price-by-user-role-settings-section.php(57): Alg_WC_Price_By_User_Role_Settings_Multipliers->get_section_settings()
   The 'Price by User Role' fields should be shown using the Ajax when the 'Enabled' dropdown is set to 'Yes' otherwise hidden. #1 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/class-wp-hook.php(307): Alg_WC_Price_By_User_Role_Settings_Section->get_settings(Array)
   Plugin does not clean up its records when deleted #2 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/plugin.php(191): WP_Hook->apply_filters(Array, Array)
   Fix 1.3 #3 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/price-by-user-role-for-woocommerce/includes/settings/class-alg-wc-settings-price-by-user-role.php(45): apply_filters('woocommerce_get...', Array)
   Fix #1 #4 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/woocommerce/includes/admin/settings/class-wc-settings-page.php(211): Alg_WC_Settings_Price_By_User_Role->get_settings('multipliers')
   Version 1.3 #5 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/class-wp-hook.php(307): WC_Settings_Page->output('')
   Able to allow the shop manager user role to edit the prices for all the user role. #6 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
   PHP CodeSniffer #7 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
   Correcting files as per phpcs #8 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/woocommerce/includes/admin/views/html-admin-settings.php(40): do_action('woocommerce_set...')
   Changes as per phpcs #9 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-settings.php(154): include('/is/htdocs/wp12...')
   Html is being displayed instead of link #10 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-menus.php(286): WC_Admin_Settings::output()
   fix #10 #11 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/class-wp-hook.php(307): WC_Admin_Menus->settings_page('')
   PHPCS strict comparison #12 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
   Added UTM param #13 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
   Updated stable tag, tags & UTM tags #14 /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-admin/admin.php(259): do_action('woocommerce_pag...')
   Price filtering is not working when different price is set for the different user roles. #15 {main}
   thrown in /is/htdocs/wp12357911_HH4C4GMTV8/www/shop.nospamproxy.de/testshop-nsp/wp-content/plugins/price-by-user-role-for-woocommerce/includes/settings/class-alg-wc-price-by-user-role-settings-multipliers.php on line 84

NOTE: I tried to replicate this error on my local where the PHP 8.0.0 is present but I am unable to replicate this error there.

Expected behavior
Such an error should not appear from our plugin.

Screenshots
https://www.screencast.com/t/3UcrRhT5R

Additional context
https://tychesoftwares.freshdesk.com/a/tickets/44811