Critical error when installing free plugins

Hello!

I am new to Matomo WordPress Plugin (again), but not to Matomo in general, so I experienced the stability of Matomo since years.

Now, I installed the marketplace for Matomo WordPress Plugin and tried to install two free plugins. The result was: both crashed the usage of Matomo with a critical WordPress Error. Matomo was not accessible anymore. This happened with both plugins seperately.

The Plugins I tried to install:

  • Gravatar
  • Turnstile/reCaptcha

Only deactivation did help to access the statistics again.
While activated, the browser showed the source code of the Matomo statistics page. Very strange. Never experienced this before in my life.

The diagnostics was giving the information, that the check could not run. The reason should have been that I am not logged in. But I was…

I would be happy, if anyone has an idea, why this happens and what I could do about it. If you need more information on my WordPress setup, please let me know.

Looking forward to a solution.