homepage not working after installing upgrade wp-statistics

These are the two errors I get after upgrading the WP statistics and I can not open any of the homepages!:
Fatal error: Call to a member function get_option() on a non-object in /storage/content/78/182678/kveservices.se/public_html/wp-content/plugins/wp-statistics/wp-statistics.php on line 25

Från <http://www.kveservices.se/&gt;

Fatal error: Call to a member function get_option() on a non-object in /storage/content/78/182678/kimvonessen.se/public_html/wp-content/plugins/wp-statistics/wp-statistics.php on line 25

Från <http://www.kimvonessen.se/wp-admin/themes.php?page=core_functions.php&gt;

What should I do? Best regards Kim/Stockholm

https://wordpress.org/plugins/wp-statistics/