diff --git a/lib/models/BlubberThread.php b/lib/models/BlubberThread.php
index cccaa3de92893845c699ccea41d92052a53b1755..0be5cd2676ac9728f3253bebe3c28ff7cde76520 100644
--- a/lib/models/BlubberThread.php
+++ b/lib/models/BlubberThread.php
@@ -459,7 +459,7 @@ class BlubberThread extends SimpleORMap implements PrivacyObject
                 if ($module = $tool->getStudipModule()) {
                     $last_visit = object_get_visit($this['context_id'], $module->getPluginId());
                     $nav = $module->getIconNavigation($this['context_id'], $last_visit, $GLOBALS['user']->id);
-                    if ($nav) {
+                    if (isset($nav) && $nav->isVisible(true)) {
                         $icons[] = $nav;
                     }
                     if ($module instanceof CoreSchedule) {