From Permalinks URLs are set to "Post", and Simple SSL is activated but when I want to create a new page, "Home" for example, and publish I get the "updating failed. the response is not a valid JSON response" error on WordPress. The site is in maintenance mode. How can I fix it?

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Jake On

Change this line on apache.conf this may fix the issue.

AllowOverride None to AllowOverride All

Refer: https://wordpress.org/support/topic/updating-failed-the-response-is-not-a-valid-json-response-32/