Call to undefined function apply_filters() in …/better-wp-security.php:16

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Hi there,

since the last update of iTS (to Vn. 5.8.0), a lot of my sites PHP-FPM logs are getting filled with messages like this:

PHP Fatal error: Uncaught Error: Call to undefined function apply_filters() in …/better-wp-security.php:16

This is happeining on at least 2 different servers, where I have not changed anything of note recently in the external environment – at least, not to my knowledge.

Cheers, Tim