Chartbeat 1.4 update causes "Warning: Missing argument 2 for WP_Widget"

  • Upgrading to Chartbeat 1.4 causes this error at the top of my site:

    Warning: Missing argument 2 for WP_Widget::__construct(), called in /path/to/wp-includes/widgets.php on line 324 and defined in /path/to/wp-includes/widgets.php on line 93

    Deactivating the plugin fixes it, activating brings back the error; it’s definitely the Chartbeat plugin.

    I suspect it has to do with the plugin code around line 232-256:

    class Chartbeat_Widget extends WP_Widget {
	function widget( $args ) {
		extract( $args );
		echo $before_widget;
		if ( get_option( 'chartbeat_apikey' ) ) : ?>
			<div id="cb_top_pages"></div>
			<script src="https://static.chartbeat.com/js/topwidgetv2.js" type="text/javascript" language="javascript"></script>
			<script type="text/javascript" language="javascript">
			var options = { };
			new CBTopPagesWidget( '<?php echo esc_js( get_option('chartbeat_apikey') ); ?>', <?php echo get_option('chartbeat_widgetconfig'); ?> );
			</script>
		<?php
		endif;
		echo $after_widget;
	}
}

function chartbeat_widget_init() {
  register_widget( 'Chartbeat_Widget' );
}

add_action('widgets_init', 'chartbeat_widget_init');
add_action('admin_menu', 'chartbeat_menu');

    https://www.ads-software.com/extend/plugins/chartbeat/

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