diff --git a/classes/local/calendar.php b/classes/local/calendar.php
index e3ef676..982d9f9 100644
--- a/classes/local/calendar.php
+++ b/classes/local/calendar.php
@@ -181,6 +181,7 @@ public static function fix_program_events(?stdClass $program): void {
              LEFT JOIN {enrol_programs_allocations} pa ON pa.id = e.instance AND e.component = 'enrol_programs'
              LEFT JOIN {enrol_programs_programs} p ON p.id = pa.programid
                  WHERE (pa.id IS NULL OR pa.archived = 1 OR p.archived = 1 OR pa.timecompleted IS NOT NULL)
+                   AND e.component = 'enrol_programs'
                        $programselect
              ORDER BY e.id ASC";
         $rs = $DB->get_recordset_sql($sql, $params);
diff --git a/tests/task/cron_test.php b/tests/task/cron_test.php
index 28d819a..d6d293e 100644
--- a/tests/task/cron_test.php
+++ b/tests/task/cron_test.php
@@ -85,4 +85,40 @@ public function test_execute() {
         $task = new \enrol_programs\task\cron();
         $task->execute();
     }
+
+    /**
+     * Tests that manual events are not deleted by the programs cron task.
+     *
+     * @see https://github.com/open-lms-open-source/moodle-enrol_programs/issues/11 Issue
+     */
+    public function test_manual_calendar_events_not_deleted() {
+        global $DB, $USER;
+        $this->setAdminUser();
+
+        $event = new \stdClass();
+        $event->userid = $USER->id;
+        $event->timestart = 0;
+        $event->name = 'test';
+
+        // Manually created events have modulename 0 and component as null.
+        $event->modulename = 0;
+        $event->component = null;
+
+        \calendar_event::create($event);
+
+        $events = $DB->get_records('event');
+        $this->assertCount(1, $events);
+        $event = current($events);
+        $this->assertNull($event->component);
+        $this->assertEquals(0, $event->modulename);
+
+        // Run cron.
+        $task = new \enrol_programs\task\cron();
+        $task->execute();
+
+        // Ensure calendar event that was created is left untouched.
+        $events = $DB->get_records('event');
+        $eventids = array_column($events, 'id');
+        $this->assertTrue(in_array($event->id, $eventids));
+    }
 }