PHP Strict standards error

I keep seeing this error in my logs:

PHP Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method GA_Filter::spool_analytics() should not be called statically in wp-includes/plugin.php on line 406

Changing the method signature to static function spool_analytics() seems to fix it. Just wanted to let you know.

http://wordpress.org/extend/plugins/google-analytics-for-wordpress/