I deactivated all plugins except for Piklist and Helpers, and I still get the same php message.

Then, I deactivated Piklist and Helpers, then reactivated them. I still get the same php message.

I am having this issue with a site. How do I fix?

Warning: extract() expects parameter 1 to be array, null given in wp-content/plugins/wp-helpers/wp-helpers.php on line 387

line 387 says…
extract(piklist::key_path($wp_filter, $tag, array(‘tag’, ‘priority’, ‘filter’)));