Headers Security Advanced & HSTS WP Version: 5.0.22 – After installing the update, the following conflict occurs when using the WP install feature:
Fatal error: Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function “hsts_plugin_remove_old_options” not found or invalid function name in …/wp-includes/class-wp-hook.php on line 310
P.S. Headers Security Advanced & HSTS WP Version: 5.0.21 that conflict did not appear.
It also doesn’t help if uninstalling or deactivating the plugin and then re-updating to the final version 5.0.22.
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