Site Search always loggs with results

Site searches won't show up under "Search Keywords with No Results", but always unter "Site Search keywords" even if there are 0 results. I tried logging with piwikTracker.trackSiteSearch(keyword, false, searchCount) and _paq.push(['setCustomUrl', location.href.toLowerCase()+ '&search_count=' + 0]);

Tracking ist sent by https://webstatistik.****.de/piwik/piwik.php?search=lalala&search_count=0&idsite=1&rec=1&r=635623&h=14&m=34&s=19&url=*******&_id=69edc544661c9f07&_idts=1441199127&_idvc=241&_idn=0&_refts=1456141849&_viewts=1456141849&_ref=https%3A%2F%2Fwww.google.de&send_image=0&pdf=0&qt=0&realp=0&wma=1&dir=0&fla=1&java=0&gears=0&ag=1&cookie=1&res=1920x1200&gt_ms=902

and gets logges by Piwik, but in the wron Report. I preferr tracking via trackSiteSearch, as the search enginge uses ajax to deliver results. I updated Piwik to 2.16.0, but still got the problem.