Plugin crashes with undefined function is_plugin_active
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A recent update (probably the one for https://wordpress.org/support/topic/fatal-error-when-relevanssi-is-not-activated/ ) is getting a runtime PHP fatal error “Call to undefined function is_plugin_active()” when making a REST query which used to work. (Relevnasi is active, but it never gets that far as the function supposedly to test whether it is or not apparently does not exist; perhaps it is called too early?).
I replaced
if (!is_plugin_active( 'relevanssi/relevanssi.php' ) && !is_plugin_active( 'relevanssi-premium/relevanssi.php' )) {withif (FALSE) {on the offending line rest-api-for-relevanssi.php:64 and it works again.
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