I hope, this is the right place to ask questions like this:
For three days, Piwik has been showing me in some widgets (“pages per visit”, “visitor countries” and “length of visit”) this error:
Fatal error: Call to a member function getColumn() on a non-object in /home/DOMAIN.TLD/hosts/DOMAIN.TLD/piwik/core/DataTable/Filter/Sort.php on line 120
Line 120 contains this:
$value = $row->getColumn($this->columnToSort);
If I choose in Piwik a timeframe to show, where there is no data to show, also the error doesn’t show. My PHP version is 5.1.6 and after the update to Piwik 0.6.1 some days/weeks ago, this error didn’t show up.
What does that mean and do you have tips to fix it?
Thanks a lot for your help!