gistfile1.txt

<?php

add_filter( 'pre_kses', 'my_checker_pre_kses' );
function my_checker_pre_kses( $content ) {
	if ( ! is_string( $content ) ) {
		echo '<pre>';
		var_dump( $content );
		var_dump( debug_backtrace() );
		echo '</pre>';
		exit;
	}
	return $content;
}