Fatal Error

HELP! No matter what I click on in my dashboard, I get the following message:

Fatal error: Uncaught Error: Call to a member function get() on null in /www/wp-includes/query.php:28 Stack trace: #0 /www/wp-content/plugins/cm-pop-up-banners/free/backend/cm-pop-up-banners-for-wordpress-backend.php(273): get_query_var('post_type') #1 /www/wp-includes/class-wp-hook.php(286): CMPopUpFlyInBackend::processQueryArg(Object(WP_Query)) #2 /www/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array) #3 /www/wp-includes/plugin.php(515): WP_Hook->do_action(Array) #4 /www/wp-includes/class-wp-query.php(1006): do_action_ref_array('parse_query', Array) #5 /www/wp-includes/class-wp-query.php(1621): WP_Query->parse_query() #6 /www/wp-includes/class-wp-query.php(3230): WP_Query->get_posts() #7 /www/wp-includes/post.php(1763): WP_Query->query(Array) #8 /www/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Tools/PersonalDataExporter.php(21): get_posts(Array) #9 /www/wp-content/plugins/wpdiscuz/forms/wpdFormAttr/Tools/PersonalDataExporter.php(16): wpdFormAttr\Tools\PersonalDataExporter->initFormsFields() #10 /ww in /www/wp-includes/query.php on line 28

I can't even get to any plugins to try deleting them.