Fatal error when WordPress Address ≠ Site Address

The plugin produces a fatal error when the WordPress installation directory differs from the site address.

• WordPress URL: https://example.com/site
• Site Address: https://example.com

Error Snippet received via WordPress alert email (I.e Your Site is Experiencing a Technical Issue)

An error of type E_ERROR was caused in line 420 of the file /home/linux/example.com/site/wp-content/plugins/cf-geoplugin/inc/classes/Utilities.php. 

Error message: Uncaught Error: Call to undefined function plugins_api() in /home/linux/example.com/site/wp-content/plugins/cf-geoplugin/inc/classes/Utilities.php:420

Stack trace:
#0 /home/linux/example.com/site/wp-content/plugins/cf-geoplugin/inc/settings/sidebar.php(244): CFGP_U::plugin_info(Array, false, false)
#1 /home/linux/example.com/site/wp-includes/class-wp-hook.php(310): CFGP_Sidebar->sidebar_statistic_plugin_info(Object(CFGP_Sidebar))
#2 /home/linux/example.com/site/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters('', Array)
#3 /home/linux/example.com/site/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /home/linux/example.com/site/wp-content/plugins/cf-geoplugin/inc/settings/sidebar.php(159): do_action('cfgp/sidebar_st...', Object(CFGP_Sidebar))
#5 /home/linux/example.com/site/wp-includes/class-wp-hook.php(310): CFGP_Sidebar->sidebar_statistic('')

Also, produces below warning

[14-Oct-2023 09:52:05 UTC] PHP Warning:  include(/home/linux/example.com/site/site/wp-admin/includes/plugin.php): failed to open stream: No such file or directory in /home/linux/example.com/site/wp-content/plugins/cf-geoplugin/constants.php on line 210

The error caused due to constants.php on line 210

include WP_ADMIN_DIR . DIRECTORY_SEPARATOR . 'includes' . DIRECTORY_SEPARATOR . 'plugin.php';    }

The WP_ADMIN_DIR somehow causing printing directory/path twice.

example.com/site/site/wp-admin/includes/plugin.php

The ideal result should be

example.com/site/wp-admin/includes/plugin.php