ErrorException: Cannot modify header information - headers already sent

[samuelpodina]

When we call the /wp-cron.php?doing_wp_cron server side in a cron task this Exception is thrown every time. Any ideas why this could happen the init hook should fire before any headers are sent anyway?

ErrorException: Cannot modify header information - headers already sent
#9 wp-content/plugins/dw-question-answer/inc/Posts/Base.php(20): handleError
#8 wp-content/plugins/wp-sentry-integration/vendor/sentry/sentry/lib/Raven/ErrorHandler.php(0): setcookie
#7 wp-content/plugins/dw-question-answer/inc/Posts/Base.php(20): dwqa_anonymous_create_session
#6 wp-includes/class-wp-hook.php(286): apply_filters
#5 wp-includes/class-wp-hook.php(310): do_action
#4 wp-includes/plugin.php(465): do_action
#3 wp-settings.php(505): require_once
#2 wp-config.php(61): require_once
#1 wp-load.php(37): require_once
#0 wp-cron.php(39): null