رفع خطای Fatal error: Uncaught Error: Call to a member function get() on null in

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یک وبسایت دارم وقتی از سرچ گوگل به سایت لینک میده و ریدیرکت میخواد بشه این پیغام میده: و پیج باز نمیشه:

Fatal error: Uncaught Error: Call to a member function get() on null in /home/calaweb1/public_html/wp-includes/query.php:28 Stack trace: #0 /home/calaweb1/public_html/wp-includes/general-template.php(1288): get_query_var('m') #1 /home/calaweb1/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics-referred.php(70): wp_title('', false) #2 /home/calaweb1/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics.php(331): WP_STATISTICS\Referred::get() #3 /home/calaweb1/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics.php(115): WP_Statistics->instantiate() #4 /home/calaweb1/public_html/wp-includes/class-wp-hook.php(287): WP_Statistics->plugin_setup('') #5 /home/calaweb1/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #6 /home/calaweb1/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #7 /home/calaweb1/public_html/wp-settings.php(409): do_action('plugins_loaded') #8 /home/calaweb1/public_html/wp-config.php(90): requ in /home/calaweb1/public_html/wp-includes/query.php on line 28

لطفا راهنمایی کنید برای رفعش. باتشکر

فایل query.php اینه:

<?php
/**
 * WordPress Query API
 *
 * The query API attempts to get which part of WordPress the user is on. It
 * also provides functionality for getting URL query information.
 *
 * @link https://developer.wordpress.org/themes/basics/the-loop/ More information on The Loop.
 *
 * @package WordPress
 * @subpackage Query
 */

/**
 * Retrieve variable in the WP_Query class.
 *
 * @since 1.5.0
 * @since 3.9.0 The `$default` argument was introduced.
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string $var       The variable key to retrieve.
 * @param mixed  $default   Optional. Value to return if the query variable is not set. Default empty.
 * @return mixed Contents of the query variable.
 */
function get_query_var( $var, $default = '' ) {
	global $wp_query;
	return $wp_query->get( $var, $default );
}

/**
 * Retrieve the currently-queried object.
 *
 * Wrapper for WP_Query::get_queried_object().
 *
 * @since 3.1.0