WPP: Oops, invalid request!

For some reason, since a couple days my views are not tracked anymore.

In the console log, I see the message “WPP: Oops, invalid request!”

For your information, I’m using WordPress 3.9.2 and WordPress Popular Posts 3.0.3 with Ajaxify enabled because I use a cache plugin.

Here is the code generated by the plugin in my blog header:

<!-- WordPress Popular Posts v3.0.3 -->
            <script type="text/javascript">//<![CDATA[
				jQuery(document).ready(function(){
					jQuery.get('https://www.resharelist.com/wp-admin/admin-ajax.php', {
						action: 'update_views_ajax',
						token: 'c0d56a573b',
						id: 517					}, function(response){
						if ( console && console.log )
							console.log(response);
					});
				});
			//]]></script>
            <!-- End WordPress Popular Posts v3.0.3 -->

Any help would be highly appreciated.

https://www.ads-software.com/plugins/wordpress-popular-posts/