Over night I received an email from my website that it has gone down, while nothing actually happened (auto updates are disabled). Investigation led to the dPlugins Collaboration plugin, which threw the following error:

Uncaught Error: Call to undefined method GuzzleHttpUtils::chooseHandler() in /home/example/domains/example.com/public_html/wp-content/plugins/dplugins-collaboration/vendor/guzzlehttp/guzzle/src/functions.php:61
Stack trace:
#0 /home/example/domains/example.com/public_html/wp-content/plugins/wp-seopress/vendor/guzzlehttp/guzzle/src/HandlerStack.php(42): GuzzleHttpchoose_handler()
#1 /home/example/domains/example.com/public_html/wp-content/plugins/wp-seopress/vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttpHandlerStack::create()
#2 /home/example/domains/example.com/public_html/wp-content/plugins/dplugins-collaboration/vendor/pusher/pusher-php-server/src/Pusher.php(69): GuzzleHttpClient->__construct()
#3 /home/example/domains/example.com/public_html/wp-content/plugins/dplugins-collaboration/src/Collaboration.php(125): PusherPusher->__construct('7dee46b5d39792b...', '6ec60acb5beaece...', '1211590', Array)

Nothing changed at all on the website or the server, but still it went down for no reason. It also looks like SEOPress had something to do with it (using incompatible Guzzle versions maybe?). Could you please let me know how this could have happened? The problem is currently fixed by disabling the Collaboration plugin.

Server info:

WordPress version 5.8.3
Current thema: blank-theme-2
Current plugin: dPlugins Collaboration (version 1.2.0)
PHP version 7.4.26

5 responses to “dPlugins Collaboration made site crash out of nothing”

  1. joshua says:


    The issue happens because Seopress plugin conflicts with the Collaboration plugin.

    We have fix this issue on the Collaboration 4.0.0-alpha version.

    • skrypt says:

      Hi Joshua,

      Thanks for your reply. I’m using both plugins on all of my (other) clients’ websites, but they’re still working perfectly fine. How could it happen that over night the one website stopped working?

      And should I update to 4.0.0-alpha yet (is it stable enough)?

      • joshua says:

        I’m not sure about it, you may turn off the Collaboration plugin once you have done editing with Oxygen Editor.

        The alpha version is not recommended to use on the production site.
        It passes our internal test, but we still waiting for enough reports from alpha users to graduate it to a stable version

  2. hschonberger says:

    My company’s WordPress website received the same error message as stated above and we had to deactivate Collaboration (version 1.2.0) in order to get our site back up and running again. We also use SEOPress (version 5.4.3). Will a Collaboration update be pushed soon to help resolve this?

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