I use "setCustomVariable" in my Piwik code as follow and I noticed, that the values are not tracked as expected.

  _paq.push(["setCustomVariable", 1, "Domain", document.domain, "visit"]);
  _paq.push(['trackPageView']);

after debugging, I've seen, that $keyValue contains a string like '["NAME", "VALUE"]' where propably an array is expected.

https://github.com/piwik/piwik/blob/master/core/Tracker/Request.php#L553

I could help myself by convert this string to back to an array.

           foreach(preg_split("/[\s,]+/", $keyValue) as $val){ 
              $keyValueModified[]=trim($val,'"[]');
            }  
               
            $keyValue=$keyValueModified;

Can somebody please take a look at this?

Regards,

Carsten