Updating to latest 1.9 version is failing and breaking site

Hi ,
There is a conflict with your ‘get_query_var’ or ‘WPCOM_Liveblog::is_entries_ajax_request’ methods.

Please see the error stack:

/nas/content/live/humanenations/wp-includes/query.php:28nStack trace:n
#0 /nas/content/live/humanenations/wp-content/plugins/liveblog/liveblog.php(550): get_query_var(‘liveblog’)n
#1 /nas/content/live/humanenations/wp-content/plugins/liveblog/liveblog.php(101): WPCOM_Liveblog::is_entries_ajax_request()n
#2 [internal function]: WPCOM_Liveblog::add_custom_post_type_support(Object(WP_Query))n
#3 /nas/content/live/humanenations/wp-includes/class-wp-hook.php(286): call_user_func_array(Array, Array)n
#4 /nas/content/live/humanenations/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)n
#5 /nas/content/live/humanenations/wp-includes/plugin.php(515): WP_Hook->do_action(Array)n
#6 /nas/content/live/humanenations/wp-includes/class-wp-query.php(1634): do_action_ref_array(‘pre_get_posts’, Array)n
#7 /nas/content/live/humanenations/wp-includes/class-wp-query.php(3230): WP_Query->get_posts()n
#8 /nas/content/live/humanenations/wp-includes/post.php(1763)
in /nas/content/live/humanenations/wp-includes/query.php on line 28