Title: PHP Warning WPACU_PREVENT_ANY_FRONTEND_OPTIMIZATION Last modified: July 6, 2021 --- # PHP Warning WPACU_PREVENT_ANY_FRONTEND_OPTIMIZATION * Resolved [Nazrinn](https://wordpress.org/support/users/nazrinn/) * (@nazrinn) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/) * I just updated the plugin to its latest version an I get the following error message: * `Warning: Constant WPACU_PREVENT_ANY_FRONTEND_OPTIMIZATION already defined in C:\xampp\htdocs\dev\barbandcarole\wp-content\plugins\wp-asset-clean-up\classes\ Plugin.php on line 437` * This appears multiple times per page on the front-end. * Any idea how to fix that? Or at least have a temporary workaround for the issue while you work on a fix. - This topic was modified 4 years, 11 months ago by [Nazrinn](https://wordpress.org/support/users/nazrinn/). Viewing 14 replies - 1 through 14 (of 14 total) * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14629570) * [@nazrinn](https://wordpress.org/support/users/nazrinn/) my apologies for this inconvenience! Can you re-download the plugin? The notice should disappear! Also, this is likely showing on a staging/dev environment. A warning like these shouldn’t show on the live website (e.g. it’s likely you’re having WP_DEBUG turned on: [https://wordpress.org/support/article/debugging-in-wordpress/](https://wordpress.org/support/article/debugging-in-wordpress/)) * Thread Starter [Nazrinn](https://wordpress.org/support/users/nazrinn/) * (@nazrinn) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14629573) * Will my settings be erased if I do that? * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14629597) * [@nazrinn](https://wordpress.org/support/users/nazrinn/) of course not as the settings are preserved in the database. You can even delete the plugin and install any version of it you need. Once you re-activate the plugin, the settings will be restored. * Thread Starter [Nazrinn](https://wordpress.org/support/users/nazrinn/) * (@nazrinn) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14629937) * I did as indicated and now I’m getting [these 3 warnings](https://i.gyazo.com/fc8b366141b9cf64ff56b34dce55658a.png). These are definitely caused by WPACU, as the warnings go away when I deactivate the plugin. * This seems to happens only on the homepage, too. - This reply was modified 4 years, 11 months ago by [Nazrinn](https://wordpress.org/support/users/nazrinn/). * [Bjarne Oldrup](https://wordpress.org/support/users/oldrup/) * (@oldrup) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14630247) * I can confirm this warning is shown on sites with debug on: * `Warning: Constant WPACU_PREVENT_ANY_FRONTEND_OPTIMIZATION already defined in/ home/oldrupdk/oldrup.net/wp-content/plugins/wp-asset-clean-up/classes/Plugin. php on line 437` * Warning introduced in version 1.3.8.0 * Previous versions did not throw that warning. * Thank you for a great plugin! 🙂 Bjarne * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14630841) * [@oldrup](https://wordpress.org/support/users/oldrup/) sorry about that! At least it doesn’t show on a live website (anyone should have switched off printing these warnings unless it’s a staging/dev website). If you delete the plugin and re- install it (all settings would be preserved), you should not have these warnings anymore! * [@nazrinn](https://wordpress.org/support/users/nazrinn/) are you sure the problem is from Asset CleanUp? The warnings seem unrelated to the plugin. * [Bjarne Oldrup](https://wordpress.org/support/users/oldrup/) * (@oldrup) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14631648) * [@gabelivan](https://wordpress.org/support/users/gabelivan/) – no no, it’s not a production site per se. I have a live test site at [https://oldrup.net/asset-cleanup/](https://oldrup.net/asset-cleanup/) specifically for testing plugins with new WordPress and PHP versions – in this case WP 5.8 and PHP 8, and as such it makes sense to have debug on. * As the debug info is shown on the front, I have chosen to downgrade Asset Cleanup for now. All settings are retained, as you also pointed out. * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14632662) * [@oldrup](https://wordpress.org/support/users/oldrup/) I understand! Usually, notices are printing on dev/staging websites due to WP_DEBUG being turned ON. It’s recommended to have it turned OFF on live websites, but your situation is different. What you can do is delete the current version you’re using (Asset CleanUp) and re-install it from WordPress.org. It should not print the same error as the tag was updated to have the bug fixed. Let me know how it goes! * [Bjarne Oldrup](https://wordpress.org/support/users/oldrup/) * (@oldrup) * [4 years, 11 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14639846) * Seems to be working perfectly now. Thank you 🙂 * [asaduzzamann](https://wordpress.org/support/users/asaduzzamann/) * (@asaduzzamann) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685101) * Hi Bjarne Oldrup , How you resolved the problem. can you explain me.. Because, i am facing the same problem. Thank you. * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685163) * [@asaduzzamann](https://wordpress.org/support/users/asaduzzamann/) delete the version you have on your website (no worries, all settings will be preserved) and re-install it from WordPress.org. It should fix the problem you’re having. * [Bjarne Oldrup](https://wordpress.org/support/users/oldrup/) * (@oldrup) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685164) * Hey [@asaduzzamann](https://wordpress.org/support/users/asaduzzamann/) * I uninstalled Asset Cleanup and re-installed from WordPress.org. That did it for me I think. * Kind regards Bjarne * [asaduzzamann](https://wordpress.org/support/users/asaduzzamann/) * (@asaduzzamann) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685202) * Hi [@gabelivan](https://wordpress.org/support/users/gabelivan/), I’ve deleted and re-install the wpacu but still, there is no change. I was enabled wp debug by wp-debugging plugin and then I am facing this problem. * Note: wp-debugging disabled now by editing the wp-config.php file. * Now, what can be solution. * Thank you. * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685248) * [@asaduzzamann](https://wordpress.org/support/users/asaduzzamann/) have you downloaded the plugin from the following link? [https://downloads.wordpress.org/plugin/wp-asset-clean-up.1.3.8.0.zip](https://downloads.wordpress.org/plugin/wp-asset-clean-up.1.3.8.0.zip)– the problem has been fixed for other users that re-downloaded the right ZIP file. Please re-check that and the time the errors get logged. Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘PHP Warning WPACU_PREVENT_ANY_FRONTEND_OPTIMIZATION’ is closed to new replies. * ![](https://ps.w.org/wp-asset-clean-up/assets/icon-256x256.png?rev=1981952) * [Asset CleanUp: Page Speed Booster](https://wordpress.org/plugins/wp-asset-clean-up/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-asset-clean-up/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-asset-clean-up/) * [Active Topics](https://wordpress.org/support/plugin/wp-asset-clean-up/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-asset-clean-up/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-asset-clean-up/reviews/) * 14 replies * 4 participants * Last reply from: [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-wpacu_prevent_any_frontend_optimization/#post-14685248) * Status: resolved