diff --git a/mod/lti/lib.php b/mod/lti/lib.php
index 5becf387a9d..96d9ca30e2e 100644
--- a/mod/lti/lib.php
+++ b/mod/lti/lib.php
@@ -637,6 +637,11 @@ function mod_lti_core_calendar_provide_event_action(calendar_event $event,
                                                       \core_calendar\action_factory $factory) {
     $cm = get_fast_modinfo($event->courseid)->instances['lti'][$event->instance];
 
+    if (!$cm->uservisible) {
+        // The module is not visible to the user for any reason.
+        return null;
+    }
+
     $completion = new \completion_info($cm->get_course());
 
     $completiondata = $completion->get_data($cm, false);
diff --git a/mod/lti/tests/lib_test.php b/mod/lti/tests/lib_test.php
index b5267131716..982a874b3b1 100644
--- a/mod/lti/tests/lib_test.php
+++ b/mod/lti/tests/lib_test.php
@@ -131,6 +131,34 @@ class mod_lti_lib_testcase extends advanced_testcase {
         $this->assertTrue($actionevent->is_actionable());
     }
 
+    public function test_lti_core_calendar_provide_event_action_as_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        // Create the activity.
+        $course = $this->getDataGenerator()->create_course();
+        $lti = $this->getDataGenerator()->create_module('lti', array('course' => $course->id));
+
+        // Create a calendar event.
+        $event = $this->create_action_event($course->id, $lti->id,
+            \core_completion\api::COMPLETION_EVENT_TYPE_DATE_COMPLETION_EXPECTED);
+
+        // Now, log out.
+        $CFG->forcelogin = true; // We don't want to be logged in as guest, as guest users might still have some capabilities.
+        $this->setUser();
+
+        // Create an action factory.
+        $factory = new \core_calendar\action_factory();
+
+        // Decorate action event.
+        $actionevent = mod_lti_core_calendar_provide_event_action($event, $factory);
+
+        // Confirm the event is not shown at all.
+        $this->assertNull($actionevent);
+    }
+
     public function test_lti_core_calendar_provide_event_action_already_completed() {
         global $CFG;
 
@@ -165,6 +193,44 @@ class mod_lti_lib_testcase extends advanced_testcase {
         $this->assertNull($actionevent);
     }
 
+    public function test_lti_core_calendar_provide_event_action_already_completed_as_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $CFG->enablecompletion = 1;
+
+        // Create the activity.
+        $course = $this->getDataGenerator()->create_course(array('enablecompletion' => 1));
+        $lti = $this->getDataGenerator()->create_module('lti', array('course' => $course->id),
+            array('completion' => 2, 'completionview' => 1, 'completionexpected' => time() + DAYSECS));
+
+        // Get some additional data.
+        $cm = get_coursemodule_from_instance('lti', $lti->id);
+
+        // Create a calendar event.
+        $event = $this->create_action_event($course->id, $lti->id,
+            \core_completion\api::COMPLETION_EVENT_TYPE_DATE_COMPLETION_EXPECTED);
+
+        // Mark the activity as completed.
+        $completion = new completion_info($course);
+        $completion->set_module_viewed($cm);
+
+        // Now, log out.
+        $CFG->forcelogin = true; // We don't want to be logged in as guest, as guest users might still have some capabilities.
+        $this->setUser();
+
+        // Create an action factory.
+        $factory = new \core_calendar\action_factory();
+
+        // Decorate action event.
+        $actionevent = mod_lti_core_calendar_provide_event_action($event, $factory);
+
+        // Ensure result was null.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Creates an action event.
      *