Title: Plugin Conflict Last modified: March 17, 2023 --- # Plugin Conflict * Resolved [mskwarwsd](https://wordpress.org/support/users/mskwarwsd/) * (@mskwarwsd) * [3 years, 2 months ago](https://wordpress.org/support/topic/plugin-conflict-383/) * Over the last few days, I’ve been seeing my site break periodically. Flushing the cache has been sufficient to resolve the issue until today, when I had to go plugin by plugin to determine a culprit. * I zeroed in on Hummingbird. When active, my site is experiencing critical errors. * Specifically, by broken, I mean it is displaying roughly mobile-width on desktop, and the navigation bar is 90% off-screen. The site is still functional, just not very usable. * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-conflict-383%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Support [Nebu John – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport14/) * (@wpmudevsupport14) * [3 years, 2 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16571720) * Hi [@mskwarwsd](https://wordpress.org/support/users/mskwarwsd/), * Trust you are doing good and sorry to know that you are experiencing this issue. * Wouldn’t you mind please confirm if you tried switching to a default WordPress theme like Twenty Twenty Three and still was able to replicate the issue? * Can you please enable WP_DEBUG_LOG and see if a PHP fatal error is being logged once you replicate the issue? If yes, can you please share the error message in your next response so that we could help you further? * I hope the following guide comes in handy: [https://wordpress.org/documentation/article/debugging-in-wordpress/](https://wordpress.org/documentation/article/debugging-in-wordpress/) * We look forward to hearing back from you. * Kind Regards, Nebu John * [jezzerisin](https://wordpress.org/support/users/jezzerisin/) * (@jezzerisin) * [3 years, 2 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16603182) * Same thing’s been happening to me. Except now I have had to remove Hummingbird entirely, as it’s crashing the whole site.I’m using WordPress 2019There’s no entry in the DebugAny further ideas?Jeremy * Plugin Support [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/) * (@wpmudev-support8) * [3 years, 2 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16606221) * Hi [@jezzerisin](https://wordpress.org/support/users/jezzerisin/) * I hope you’re well today! * I understand that you are experiencing similar/same issue and you’re of course welcome to keep an eye on this ticket. However, in order to request assistance please start a new, separate ticket of your own, as per this forum rules * [https://wordpress.org/support/forum-user-guide/faq/#i-have-the-same-problem-can-i-just-reply-to-someone-elses-post-with-me-too](https://wordpress.org/support/forum-user-guide/faq/#i-have-the-same-problem-can-i-just-reply-to-someone-elses-post-with-me-too) * We’ll help you there. * Kind regards, Adam * Plugin Support [Nithin – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport11/) * (@wpmudevsupport11) * [3 years, 2 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16636021) * Hi [@mskwarwsd](https://wordpress.org/support/users/mskwarwsd/), * Since we haven’t heard from you for a while. I’ll mark this thread as resolved for now. Please feel free to re-open the thread if you need further assistance. * Best Regards Nithin * Thread Starter [mskwarwsd](https://wordpress.org/support/users/mskwarwsd/) * (@mskwarwsd) * [3 years ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16758676) * Hi there, I have reviewed the guide and I have tried enabling debug mode to get more info. I didn’t get any new info. I did see a fatal error related to memory consumption, but I’ve resolved that error, and the plugin is still exhibiting the problematic behavior. There are no other errors to speak of. I was hopeful this would have been a widespread enough issue that would have been resolved in future updates, but the issue persists today. We’ve been running now for over 2 months without the plugin. If there isn’t a simple solution, the easiest path for us will be to remove the plugin, as it is only causing us problems. * Plugin Support [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/) * (@wpmudev-support8) * [3 years ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16760690) * Hi [@mskwarwsd](https://wordpress.org/support/users/mskwarwsd/) * Thank you for response! * I’m really sorry that you are experiencing this issue and let me assure you that we’ll do everything in our powers to help with this. However, we first need to find out why it is happening in the first place and what is causing it – as it is not default or expected behavior and we do not have any known bugs related to this currently. * Even if it happens on more than a single page (as other person also mentioned it), it still must have some specific reasons which we need to identify to be able to replicate it and then – if it really is a bug, investigate and implement a fix; or – if it is something related to 3rd-party issues, find workaround. * — * That being said, I re-read your initial post and I think this part may be the key here: “_Specifically, by broken, I mean it is displaying roughly mobile-width on desktop, and the navigation bar is 90% off-screen. The site is still functional, just not very usable._” * This suggests that the cached mobile version is served in every case. It’s not something Hummingbird would do “on its own” though. If it has Page Caching enabled, there is a setting in Page Cache settings called “Cache on mobile devices”. * With it enabled, there’ll be two different sets of cache created – separate for desktoip and separate for mobile devices. They’d be served based on WordPress core “[wp_is_mobile()](https://developer.wordpress.org/reference/functions/wp_is_mobile/)” function. * Now if it happens that it always serves this mobile (and additionally broken) version of page – even after clearing cache in Hummingbird – it suggests that * – either “something” on site is breaking or in other ways “affecting” this mobile detection – or, more likely, there is some additional caching layer involved that’s not “in sync” with site/Hummingbird. * I believe you have considered that already but just to make sure: is there any server-side cache active (if yes, what kind)? Are you using any other caching and/or asset optimization plugins on site (if yes, what are they)? Is there any CDN (like CloudFlare or similar) integrated with you hosting plan and currently in use – if yes, what is that? * Kind regards, Adam * Thread Starter [mskwarwsd](https://wordpress.org/support/users/mskwarwsd/) * (@mskwarwsd) * [3 years ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16760822) * Hey thanks for your reply. * With hummingbird enabled, the “roughly mobile-width” display on desktop with Hummingbird enabled isn’t the mobile view of the site, it’s just a roughly mobile- width version that’s very broken looking. I’m not sure if that is still aligned with your theory about a mobile cached version displaying on desktop or not, but figured it’d be relevant to clarify. * We are not using any CDN. The only reference to any cdn I could find within the site’s source code was a reference to “[https://stats.wpmucdn.com/analytics.js”](https://stats.wpmucdn.com/analytics.js”);, which I assume is not the culprit here. * There is no server-side caching other than whatever might be default server-side caching provided by a registrar/host. The only (client-side) plugin for caching we were using was Hummingbird. * Plugin Support [Jair – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport15/) * (@wpmudevsupport15) * [3 years ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16768767) * Hi [@mskwarwsd](https://wordpress.org/support/users/mskwarwsd/), * I hope you are doing well today! * I checked the site as desktop and mobile versions and could not see any issues, so it seems you have already deactivated Hummingbird. It is essential for us to check the issue while it is active. * Kind regards, Zafer - This reply was modified 2 years, 11 months ago by [Marius L. J.](https://wordpress.org/support/users/clorith/). Reason: Removed credential details left in a template by accident * Plugin Support [Patrick – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport12/) * (@wpmudevsupport12) * [2 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16914090) * Hi [@mskwarwsd](https://wordpress.org/support/users/mskwarwsd/) * I hope you are doing well and safe! * We haven’t heard from you in a while, I’ll mark this thread as resolved. * Feel free to let us know if you have any additional questions or problems. * Best Regards Patrick Freitas Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘Plugin Conflict’ is closed to new replies. * ![](https://ps.w.org/hummingbird-performance/assets/icon-256x256.gif?rev=2633221) * [Hummingbird Performance - Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN](https://wordpress.org/plugins/hummingbird-performance/) * [Frequently Asked Questions](https://wordpress.org/plugins/hummingbird-performance/#faq) * [Support Threads](https://wordpress.org/support/plugin/hummingbird-performance/) * [Active Topics](https://wordpress.org/support/plugin/hummingbird-performance/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/hummingbird-performance/unresolved/) * [Reviews](https://wordpress.org/support/plugin/hummingbird-performance/reviews/) * 9 replies * 7 participants * Last reply from: [Patrick – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport12/) * Last activity: [2 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-383/#post-16914090) * Status: resolved