We are using the latest K2 version under Joomla 3.8.0.

When we click on the rating/voting stars either on the item details page or on the category item details one, the AJAX call is made to a non-valid url of the form:

www.mycompany.com/el/undefinedindex.php?option=com_k2&view=item&task=vote&format=raw&user_rating=4&itemID=590

If the correct AJAX call is made, that is:

www.mycompany.com/index.php?option=com_k2&view=item&task=vote&format=raw&user_rating=4&itemID=590

then the system counts the vote and returns a valid text ("Ευχαριστούμε για την βαθμολογία!").

How can this erroneous URL AJAX call can be fixed?

Hello there,

Is there a link to your site available?

Sure.. where can I PM you one?

You can paste the link here.

OK .. here you are.

www.prettypartyideas.com/blog/free-printable-party-kit

Are you using SH404SEF?
Is it up to date?

Sorry for the late reply..

Yes, we are using the latest sh404sef 4.11. The SEO settings for K2 are set to use Joomla router for SEO.

Issue still persists :(

This is not the default behaviour as you might have imagined.
Flush all links if you changed any settings in SH404.
If that doesn't do the trick you can correct this here: github.com/getk2/k2/blob/master/media/k2/assets/js/k2.frontend.js#L183

Actually, the issue lies some lines before the one you mentioned, i.e.:
The function getUrlParams reads for all the script declarations on the page and tries to find k2.frontend.js among the ones loaded on the page.
As we employ page compression, k2.frontend.js is not loaded through a script declaration since it is part of a compressed file with another filename.
Therefore, K2SitePath variable is never set and the value returned is always "undefined".

I performed a quick fix by:

I believe however that an alternative way of determining the value should be sought out..

Kudos,

Yes maybe a check if the value is undefined and manually adding a slash might have a point.

Thank you for your feedback.