Lots of PHP Error

The current version of the plugin is throwing a ton of errors in our error logs. Our host contacted us because it’s causing the site to slow down. Please see the error below. Any ideas?

[Fri Jun 30 09:00:17.754875 2017] [:error] [pid 10503] [client 68.***.***.**] PHP Fatal error: Uncaught Error: Call to a member function log() on null in /nas/content/live/site/wp-content/plugins/bwp-google-xml-sitemaps/src/class-bwp-gxs.php:2545\nStack trace:\n#0 /nas/content/live/site/wp-content/plugins/bwp-google-xml-sitemaps/src/class-bwp-gxs.php(2573): BWP_Sitemaps->_log_message_item(‘Pinged Goog…’, ‘success’)\n#1 /nas/content/live/site/wp-content/plugins/bwp-google-xml-sitemaps/src/class-bwp-gxs.php(2603): BWP_Sitemaps->log_message(‘Pinged Goog…’, ‘success’)\n#2 /nas/content/live/sites/wp-content/plugins/bwp-google-xml-sitemaps/src/class-bwp-gxs.php(3961): BWP_Sitemaps->log_success(‘Pinged Goog…’)\n#3 [internal function]: BWP_Sitemaps->ping(Object(WP_Post))\n#4 /nas/content/live/site/wp-includes/class-wp-hook.php(298): call_user_func_array(Array, Array)\n#5 /nas/content/live/site/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(”, Array)\n#6 /nas/content/live/site/wp-includes/plugin.php(453): WP_Hook->do_action(Array)\n#7 in /nas/content/live/site/wp-content/plugins/bwp-google-xml-sitemaps/src/class-bwp-gxs.php on line 2545