Title: Fatal error outut buffering Last modified: August 24, 2016 --- # Fatal error outut buffering * Resolved [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/) * Since some days i’m receiving the following error when clicking on statistics overview (only there): * Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0 * Here’s the output of the firefox browser console: * ReferenceError: reference to undefined property l._originalListener event-emitter. js:108:8 JavaScript 1.6’s for-each-in loops are deprecated; consider using ES6 for-of instead ScriptSurrogate.js:346:1634 SyntaxError: test for equality (==) mistyped as assignment (=)? jquery.js:2:6151 SyntaxError: test for equality ( ==) mistyped as assignment (=)? jquery.js:2:6377 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:7633 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:9510 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11072 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11648 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11686 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12647 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12959 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:14780 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15044 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15192 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:16264 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18595 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18684 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18744 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20027 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20587 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20695 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14175 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14302 SyntaxError: in strict mode code, functions may be declared only at top level or immediately within another function jquery.js:3:18951 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:25868 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:28239 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:90 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:1897 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2341 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2755 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:5998 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:8484 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:10386 ReferenceError: reference to undefined property n.event. triggered jquery.js:3:4791 ReferenceError: reference to undefined property c[ b] jquery.js:2:30974 JavaScript 1.6’s for-each-in loops are deprecated; consider using ES6 for-of instead ScriptSurrogate.js:345:209 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:6151 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:6377 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:7633 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:9510 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11072 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11648 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11686 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12647 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12959 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:14780 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15044 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15192 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:16264 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18595 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18684 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18744 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20027 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20587 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20695 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14175 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14302 SyntaxError: in strict mode code, functions may be declared only at top level or immediately within another function jquery.js:3:18951 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:25868 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:28239 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:90 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:1897 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2341 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2755 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:5998 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:8484 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:10386 ReferenceError: reference to undefined property n.event. triggered jquery.js:3:4791 ReferenceError: reference to undefined property c[ b] jquery.js:2:30974 JavaScript 1.6’s for-each-in loops are deprecated; consider using ES6 for-of instead ScriptSurrogate.js:346:1634 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:6151 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:6377 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:7633 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:9510 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11072 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11648 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:11686 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12647 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:12959 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:14780 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15044 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:15192 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:16264 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18595 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18684 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:18744 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20027 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20587 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:2:20695 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14175 SyntaxError: test for equality( ==) mistyped as assignment (=)? jquery.js:3:14302 SyntaxError: in strict mode code, functions may be declared only at top level or immediately within another function jquery.js:3:18951 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:25868 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:3:28239 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:90 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:1897 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2341 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:2755 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:5998 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:8484 SyntaxError: test for equality (==) mistyped as assignment( =)? jquery.js:4:10386 ReferenceError: reference to undefined property n.event. triggered jquery.js:3:4791 ReferenceError: reference to undefined property c[ b] * [https://wordpress.org/plugins/wp-statistics/](https://wordpress.org/plugins/wp-statistics/) Viewing 14 replies - 1 through 14 (of 14 total) * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991255) * This isn’t a client side issue but a PHP problem. Have you updated any plugins recently? * Try disabling your other plugins untill the error goes away. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991275) * This was the first i tried. For some days it worked. But after some plugin updates the error came back. First i thought about a memory problem, cause the site is running shares space. * The problen is, i cannot disable all plugins cause a lot of them are necessary to keep the site running. * But i can choose between some PHP Versions. I updated from PHP 5.4 to 5.6 and will see how it works. * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991284) * Are you using any caching plugins? * A quick Internet search found a few references to this error in conjunction with caching plugins. * If you are try disabling it and see if the problem occurs. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991289) * Ok, first i switched to 5.6.6 RC1. This ends up in a white page without error message. No output on the firefox browser console. * No, i do not use any caching plugins, but using usind WordPress caching. Set WP_CACHE to false in wp-config. * But this did not help, the fatal error is back. * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991374) * Check the optimization page and see how much memory your overview page is using in comparison to how much has been allocated to your server. * You could also try turning off some of the widgets on the overview page and see if the error goes away or not. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991419) * The overview page is using 63.438.848 Bytes, the PHP limit ist 256 MB, but what looks strange for me is that PHP-Memory used is 28.394.764 Bytes * So i have no access to the php.ini. I’m running on shared space. But i can try to place a own written php.ini in the correct directory and see if that helps. But i need to know where. * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991424) * Those numbers look fine, PHP memory usage reflects memory usage at the time the function call is made (aka near the beginning of the load of the optimization page) so 28M would be expected. * The Overview page is calculated at the end of the page load of the overview page so it captures all of the memory usage on the page. * The only thing I can recommend at this point is to try disabling plugins during non-peak usage hours to see if you can identify the conflict. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991448) * Tested around a while, disabled a plugin and checked if it will work, if not, this plugin was re-enabled and the next disabled and so on. * I could not identify a specific plugin causing the problem. Maybe that more than one plugin is needed to disable to get the overwiew work. * And there are plugins i cannot disable. The site is using Cloudflare and so the plugins CloudFlare and CloudFlare Flexible SSL needs to stay active. In addition there is SSL Insecure Content Fixer running, but disabling this will not solve the problem. * i also have a feeling that this is a memory problem, other WPS pages like hits are working without problem. * Also i can imagine that this problem deals somewhere with the cloudflare plugin. I have another site with similar traffic, but no cloudflare, and there the overview page is running. All other parameters, like memory, php version and so on are the same. * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991451) * Can you ask CloudFlare support for help? Perhaps they can determine what is wrong. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991460) * Did some testing last night and can confirm that the Cloudflare Plugin is causing the error. * When disabling it, the overview will work. I will open a ticket there and post the link to it here so that you can follow up the issue. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991461) * Here ist the link to the Cloudflare problem ticket: * [https://wordpress.org/support/topic/activating-cloudflare-plugin-causes-fatal-error?replies=1#post-6822694](https://wordpress.org/support/topic/activating-cloudflare-plugin-causes-fatal-error?replies=1#post-6822694) * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991468) * Sounds good. * Thread Starter [rb1958](https://wordpress.org/support/users/rb1958/) * (@rb1958) * [11 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991494) * Just to complete this issue: * Due to absolutely no feedback of Cloudflare, i cancelled the use of it. * So for me, everything is fine now. * Marking this issue as resolved. * Plugin Contributor [Greg Ross](https://wordpress.org/support/users/gregross/) * (@gregross) * [11 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991495) * Thanks for closing the loop. Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘Fatal error outut buffering’ is closed to new replies. * ![](https://ps.w.org/wp-statistics/assets/icon.svg?rev=3081064) * [WP Statistics – Simple, privacy-friendly Google Analytics alternative](https://wordpress.org/plugins/wp-statistics/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-statistics/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-statistics/) * [Active Topics](https://wordpress.org/support/plugin/wp-statistics/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-statistics/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-statistics/reviews/) * 14 replies * 2 participants * Last reply from: [Greg Ross](https://wordpress.org/support/users/gregross/) * Last activity: [11 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-outut-buffering/#post-5991495) * Status: resolved