diff --git a/class/ReportBuilder.php b/class/ReportBuilder.php
index 4e1dc16..0038347 100644
--- a/class/ReportBuilder.php
+++ b/class/ReportBuilder.php
@@ -19,7 +19,7 @@ class ReportBuilder
 
         // get IDs
         $tests = $testMgr->getResultsByGameId($gameid, $filter, $ordering, true, $groupFilter);
-        $ids = array_map(fn($test) => $test->getId(), $tests);
+        $ids = array_map(fn($test) => $test["_id"], $tests);
 
         // generate stats
         return $testMgr->generateDetailedStats($gameid, $ids);
diff --git a/interface.php b/interface.php
index b3062d5..2e495cd 100644
--- a/interface.php
+++ b/interface.php
@@ -532,8 +532,7 @@ function generate_report_by_groups(ReqHandler &$rh, array $params): string
     global $user;
 
     $gameid = trim($params["gameid"]);
-    $filter = trim($params["filter"]);
-    $ordering = trim($params["orderby"]);
+    $filter = trim($params["filter"] ?? "");
     $groups = explode_list(trim($params["groups"])); // TODO: lehessen több csoportra is
 
     $game = $gameMgr->getGame($gameid);
@@ -546,7 +545,7 @@ function generate_report_by_groups(ReqHandler &$rh, array $params): string
     // assemble report
     $report = new Report($game->getName());
     foreach ($groups as $groupname) {
-        $stats = ReportBuilder::getStatsByFilters($gameid, $filter, $groupname, $ordering);
+        $stats = ReportBuilder::getStatsByFilters($gameid, $filter, $groupname, "");
         $section = new ReportSection($groupname, $stats);
         $report->addSection($section);
     }