[Plugin: Simply Poll] FATAL ERROR

After click in button VOTE

Fatal error: Call to a member function logVar() on a non-object in /home/storage/7/XX/XX/XXXXXXXX/public_html/wp/wp-content/plugins/simply-poll/lib/submit.php on line 7

plugin NOT WORKING

http://ww.wp.xz.cn/extend/plugins/simply-poll/