Cannot use output buffering error – stacktrace

  • I get random errors with W3 Total Cache. This happens on 2 sites with different themes and plugins (common plugins are Captcha, WordPress SEO and iThemes Security)

    The error + stacktrace is:
03-Sep-2014 07:26:32 UTC] PHP Fatal error:  Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
[03-Sep-2014 07:26:32 UTC] PHP Stack trace:
[03-Sep-2014 07:26:32 UTC] PHP   1. shutdown_action_hook() /var/www/mysite/cms/wp-includes/load.php:0
[03-Sep-2014 07:26:32 UTC] PHP   2. do_action() /var/www/mysite/cms/wp-includes/load.php:573
[03-Sep-2014 07:26:32 UTC] PHP   3. call_user_func_array() /var/www/mysite/cms/wp-includes/plugin.php:470
[03-Sep-2014 07:26:32 UTC] PHP   4. wp_ob_end_flush_all() /var/www/mysite/cms/wp-includes/plugin.php:470
[03-Sep-2014 07:26:32 UTC] PHP   5. ob_end_flush() /var/www/mysite/cms/wp-includes/functions.php:2935
[03-Sep-2014 07:26:32 UTC] PHP   6. W3_Plugin_TotalCache->ob_callback() /var/www/mysite/cms/wp-includes/functions.php:2935
[03-Sep-2014 07:26:32 UTC] PHP   7. w3tc_do_ob_callbacks() /var/www/mysite/cms/assets/plugins/w3-total-cache/lib/W3/Plugin/TotalCache.php:639
[03-Sep-2014 07:26:32 UTC] PHP   8. call_user_func() /var/www/mysite/cms/assets/plugins/w3-total-cache/inc/functions/plugin.php:23
[03-Sep-2014 07:26:32 UTC] PHP   9. W3_PgCache->ob_callback() /var/www/mysite/cms/assets/plugins/w3-total-cache/inc/functions/plugin.php:23
[03-Sep-2014 07:26:32 UTC] PHP  10. W3_PgCache->_can_cache_buffer() /var/www/mysite/cms/assets/plugins/w3-total-cache/lib/W3/PgCache.php:337
[03-Sep-2014 07:26:32 UTC] PHP  11. W3_PgCache->_send_headers() /var/www/mysite/cms/assets/plugins/w3-total-cache/lib/W3/PgCache.php:1547

    Is it a known issue?

    https://www.ads-software.com/plugins/w3-total-cache/

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  • Thread Starter gaspy

    (@gaspy)

    I selectively disabled Captcha, WordPress SEO and iThemes but the same error persists.

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