• Hi, when enabling WordPress debug mode, the following error is being presented on every page:

    Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method CrossRef::loadScript() should not be called statically in /home/foo/public_html/wp-includes/plugin.php on line 496

    https://www.ads-software.com/plugins/esv-crossref/

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