diff --git a/course/report/stats/report.php b/course/report/stats/report.php
index 65962dd596732..e13f06423b6f6 100644
--- a/course/report/stats/report.php
+++ b/course/report/stats/report.php
@@ -98,7 +98,7 @@
                 .' ORDER BY timeend DESC';
         }
 
-        $stats = $DB->get_records_sql($sql, $params);
+        $stats = $DB->get_records_sql($sql);
 
         if (empty($stats)) {
             echo $OUTPUT->notification(get_string('statsnodata'));
diff --git a/lib/statslib.php b/lib/statslib.php
index e987ff9558de8..8a499176ffd12 100644
--- a/lib/statslib.php
+++ b/lib/statslib.php
@@ -1333,8 +1333,8 @@ function stats_get_report_options($courseid,$mode) {
     case STATS_MODE_GENERAL:
         $reportoptions[STATS_REPORT_ACTIVITY] = get_string('statsreport'.STATS_REPORT_ACTIVITY);
         if ($courseid != SITEID && $context = get_context_instance(CONTEXT_COURSE, $courseid)) {
-            $sql = 'SELECT r.id,r.name FROM {role} r JOIN {stats_daily} s ON s.roleid = r.id WHERE s.courseid = '.$courseid;
-            if ($roles = $DB->get_records_sql($sql)) {
+            $sql = 'SELECT r.id, r.name FROM {role} r JOIN {stats_daily} s ON s.roleid = r.id WHERE s.courseid = :courseid GROUP BY s.roleid';
+            if ($roles = $DB->get_records_sql($sql, array('courseid' => $courseid))) {
                 foreach ($roles as $role) {
                     $reportoptions[STATS_REPORT_ACTIVITYBYROLE.$role->id] = get_string('statsreport'.STATS_REPORT_ACTIVITYBYROLE). ' '.$role->name;
                 }