Plugin Detective – Troubleshooting Conflicts


Plugin Detective helps you troubleshoot issues on your site quickly and easily to find the cause of a problem. Once the culprit is found, the problem plugin can be quickly deactivated. You can even fix your site when it has the white screen of death (fatal error). You’ll want to have Plugin Detective installed, so if your site crashes from a conflict or bad plugin update, you can get it back up and running quickly!

We’ve all been there – something’s broken on your site. You’ve looked around the web for advice about what to do and have stumbled across the typical wisdom – deactivate all your plugins and then re-activate them one-by-one, checking your site for the problem after each reactivation.


Sure, it works. But who has time for that?

Find Plugin Conflicts with Detective Otto Bot

Detective Otto Bot walks you through solving your case one step at a time, all from one single screen.

Just open up a case and tell Detective Otto where you’re seeing the problem. If there are any plugins that are required for your site to run correctly, tell Otto about those too.

Then Otto will interrogate the suspects and keep track of clues, checking in with you from time to time. All you need to do is answer “Yes, it’s fixed” or “No, it’s still broken” each time. Otto does the rest and finds the culprit in just minutes.

Best of all – Plugin Detective can work even if you’re just seeing the White Screen of Death on your site or if all you can see are PHP errors. See the FAQ’s for how to access plugin detective and log into WordPress even if you can’t get to your login screen.

Once Otto has identified the culprit, you can quickly deactivate the troublesome plugin and go about your day.

Who Can Use This Troubleshooting Tool?

Plugin Detective is a tool that requires no coding experience or technical knowledge to use. For that reason, Plugin Detective is the ideal troubleshooting and conflict-checking tool for:

  • Any WordPress website owner
  • Developers and technical support engineers
  • Plugin and theme owners and their support teams

Debug Tool Features

  • Strategically activate and deactivate plugins on your site to help you find the plugin causing trouble
  • Open Plugin Detective for troubleshooting on any page on your site – both in the backend and the frontend!
  • Choose any subset of your active plugins as the baseline for your testing

Loved by Plugin Support Teams

The Simply Schedule Appointments and Draw Attention support teams love to share this conflict-checking tool with their customers.
Plugin Detective makes it easy for their clients to debug performance issues and figure out plugin conflicts in a jiffy!

1.2.14 – 2023-06-10

Features and Improvements

  • Fix PHP 8.2 compatibility

1.2.13 – 2023-05-25

Features and Improvements

  • Update required WP version to 6.1

1.2.12 – 2023-05-25

Features and Improvements

  • Update required WP version to 6.1

1.2.11 – 2023-04-27

Features and Improvements

PR:#25 – Compatibility with WordPress 6.2

1.2.10 – 2023-04-11


PR:#19 – Prevent fatal error on WP versions where WP_Textdomain_Registry doesn…

Features and Improvements

1.2.9 – 2023-03-28


Features and Improvements

1.2.8 – 2023-03-28


Features and Improvements

1.2.7 – 2023-03-28


Features and Improvements

1.2.6 – 2023-02-24

  • no changes


  • Fixed for WP 6.1 compatibility


  • Fixed for WP 5.9 compatibility


  • Fixed for WP 5.8 compatibility


For older changelog entries, please see the additional changelog.txt file delivered with the plugin.


  • Troubleshoot link on the admin bar
  • Welcome screen
  • Seeing the problem on Otto’s screen
  • Marking the key witnesses (required plugins)
  • Testing Otto’s screen to see if the problem is still there
  • Culprit found! Option to disable the problem plugin


Manual Installation

  1. Upload the entire /plugin-detective directory to the /wp-content/plugins/ directory.
  2. Activate Plugin Detective through the ‘Plugins’ menu in WordPress.


How do I use Plugin Detective?

Install Plugin Detective. Then from the WordPress admin, you’ll find Plugin Detective under the Tools menu.

Alternatively, you’ll find a Troubleshoot link added to your admin bar. Click this link on any page, admin or front end, to troubleshoot an issue you’re seeing on that page.

I just see errors or a white screen. Can I still use Plugin Detective to troubleshoot what’s gone wrong?

As long as you can still access your hosting account, you can install Plugin Detective via FTP. We’ve included instructions for Manual Installation on the Installation tab.

Once Plugin Detective is installed, head to You’ll be asked to log in with your WordPress username and password just to make sure you have the right permissions and then Detective Otto Bot will step you through troubleshooting just like always.

How does Detective Otto figure out which plugin is breaking my site?

Detective Otto learns from you. While interrogating the different suspects, Otto will check in with you to see if the issue is still happening on your site or not. You just need to answer “Fixed” or “Broken” after Otto makes a change.

Each of your answers provides Otto another clue that he is able to use to narrow down the list of plugins to find just the one that’s causing the problem.

What if it’s not easy to see what’s broken?

There’s no time limit on the clues for Otto. Some issues are more complex than others. You can use the embedded screen Otto provides you to step through several steps to see if the issue appears, or you can even open your site in a new window and step through whatever steps it takes to replicate the problem you’re having. Once you have the answer – minutes or even hours later – you can tell Otto either “Yes, it’s fixed” or “No, it’s still broken”.

Is this faster than me troubleshooting my plugins manually?

Yes, it’s much faster. Robots can be really fast at figuring out puzzles like these, and Detective Otto Bot is no exception. Rather than disabling your plugins one-by-one, Otto can disable groups of plugins, and use your answers to quickly narrow the scope of his investigation using binary search (a fancy robot term for saving you time).

I told Detective Otto that the problem was fixed, so why is he still interrogating suspects?

Likely Otto was interrogating a group of suspects at the time. The clue that the problem was fixed only narrows it down to the suspect being in that group. Give Otto a couple more rounds of interrogation, and he’ll find the exact plugin that’s causing your problem.

Does Plugin Detective work on multisite installs?

No, we don’t support multisite yet. We wanted to get Plugin Detective out there for people to use as soon as possible, but there’s a good amount of work to do before it will support multisite. As you may know, multisite can get a bit complicated.

With a single install, it’s easy to determine which plugins are active and manipulate them. With a multisite, there are network-activated plugins and plugins at the site level. And theoretically Plugin Detective could be run the whole network, or just looking at a single site. And there are permission differences between a network admin and a site admin. So it will take some work for us to support all that. We want to see how much interest there is in supporting multisite, and get some feedback from multisite users to understand what would be most useful for them and how they’d use it.

If you’re reading this, you likely want to use Plugin Detective to troubleshoot multisite installs. Please send us an email ( to let us know you’re interested and answer a few questions to help us build this the right way:

Would this just be a tool for you (the network admin)? Or would you want your site admins to be able to run it (and I assume they could only test their site-activated plugins, not disable any that you’ve network-activated?)


🌸5️⃣ 20, 2024
This was really helpful, also so cute!!
🌸5️⃣ 7, 2024
If you, like me, aren’t a developer but find yourself in the WP dashboard of your own sites trying to figure out which new plugin or plugin update caused mayhem, Plugin Detective is the easy-to-use diagnostic tool you want. It triages the problem and identifies the culprit within minutes. Plus the UI is fun, quirky and engaging creating an enjoyable mystery game out of what would otherwise be a frustrating task.
🌸4️⃣ 1, 2024
I could NOT figure out what was wrong with my WP site. I searched everything and finally gave up the manual search. I didn’t have high hopes, but I decided to at least try one more thing, so I ran Plugin Detective. No joke, this tool found the issue in minutes … MINUTES. I recommend this highly to all of my WP friends when they can’t figure out what went wrong.
🍃3️⃣ 28, 2024
I love this plugin, it has helped me save soooooo much time!!! Thanks!!!!
Read all 43 reviews

Contributors & Developers

“Plugin Detective – Troubleshooting Conflicts” is open source software. The following people have contributed to this plugin.


“Plugin Detective – Troubleshooting Conflicts” has been translated into 8 locales. Thank you to the translators for their contributions.

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