php problem

Hi,

after last updates of the WP and plugin this messages is shown in all posts where I don’t use the signature.

Warning: array_key_exists() expects parameter 2 to be array, null given in /home/b4bbg/public_html/wp-content/plugins/wp-post-signature/wp-post-signature.php on line 43

Could you help me to fix this?

thank you

http://ww.wp.xz.cn/plugins/wp-post-signature/