Meta Box

All of the above errors occurred because there was an element missing from the properties array: 'fields' => array():

    $meta_boxes[] = array (
        'title' => 'Log Book',
        'id' => 'log-book',
        'post_types' => array(
            0 => 'log_book',
        ),
        'context' => 'normal',
        'priority' => 'high',
    'fields' => array()
    );

I had an empty meta-box configured, as I wanted to use the front-end form for this type but only for the default WordPress editor/title.