diff --git a/lib/navigationlib.php b/lib/navigationlib.php
index 0483f24c5c3..b51ca12e418 100644
--- a/lib/navigationlib.php
+++ b/lib/navigationlib.php
@@ -2421,16 +2421,19 @@ class global_navigation extends navigation_node {
             $participants = $coursenode->add(get_string('participants'), new moodle_url('/user/index.php?id='.$course->id), self::TYPE_CONTAINER, get_string('participants'), 'participants');
             $currentgroup = groups_get_course_group($course, true);
             if ($course->id == $SITE->id) {
+                $filtervar = 'courseid';
                 $filterselect = '';
             } else if ($course->id && !$currentgroup) {
+                $filtervar = 'courseid';
                 $filterselect = $course->id;
             } else {
+                $filtervar = 'groupid';
                 $filterselect = $currentgroup;
             }
             $filterselect = clean_param($filterselect, PARAM_INT);
             if (($CFG->bloglevel == BLOG_GLOBAL_LEVEL or ($CFG->bloglevel == BLOG_SITE_LEVEL and (isloggedin() and !isguestuser())))
                and has_capability('moodle/blog:view', context_system::instance())) {
-                $blogsurls = new moodle_url('/blog/index.php', array('courseid' => $filterselect));
+                $blogsurls = new moodle_url('/blog/index.php', array($filtervar => $filterselect));
                 $participants->add(get_string('blogscourse','blog'), $blogsurls->out());
             }
             if (!empty($CFG->enablenotes) && (has_capability('moodle/notes:manage', $this->page->context) || has_capability('moodle/notes:view', $this->page->context))) {