Taxonomy.php error appearing in the header of my site [closed]

The problem is going to be with theme or plugin code, not with the Core code. Something is using that function incorrectly. For example, this:

taxonomy_exists(array());

… produces a Warning that ought to look familiar:

Warning: Illegal offset type in isset or empty in
/path/to/wordpress/wp-includes/taxonomy.php
on line 231

So, somewhere, something is passing a bad argument to that function– presumably something in your header or something hooked to hooks that execute in the header. Without more code, that is the best I can do.

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