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If you’re getting the above error, login as an administrator and go into Appearance and select any stock WordPress theme. See if that resolves the issue with WordPress 5.4. It did for me.

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WordPress Security Tips 2019

  • Before you install the latest and greatest hyped WordPress security plugin out there, first, do some basic inventory of what lives in the DocumentRoot – depending on your setup, there may be several of these locations. Manually examine them closely using a shell or file browser.

  • Setup a @vultr VPS for $6/month and utilize the provided IPv4 address to enforce IP-based restriction in any and all your WordPress sites – most importantly, your /wp-admin/ and /wp-json/ areas. There are other uses for such VPS – the IP address stuff is just one of many.

  • Inventory your plugins & themes thoroughly – don’t need it? deactivate then delete it completely from /wp-content/plugins/ and /wp-content/themes/. Don’t let any be a sitting duck waiting to be exploited.

  • And lastly, ensure your site(s) are running the latest WordPress code base.