missing "c" in the variable search_term

main/auth/courses.php

@@ -156,7 +156,7 @@ if (isset($_REQUEST['subscribe_course'])) {
 }
 // We are unsubscribing from a course (=Unsubscribe from course).
 if (isset($_GET['unsubscribe'])) {
-    $search_term = isset($_GET['searh_term']) ? $_GET['search_term'] : null;
+    $search_term = isset($_GET['search_term']) ? $_GET['search_term'] : null;
     if ($ctok == $_GET['sec_token']) {
         $courses_controller->unsubscribe_user_from_course($_GET['unsubscribe'], $search_term, $categoryCode);
             //$message = remove_user_from_course($_user['user_id'], $_POST['unsubscribe']);