diff --git a/application/modules/courses/models/CourseModel.php b/application/modules/courses/models/CourseModel.php
index 4e68721620ded662ea480f88248ac985018239c6..7f87fd391f5cce8c2b1496ab3b426729af088152 100644
--- a/application/modules/courses/models/CourseModel.php
+++ b/application/modules/courses/models/CourseModel.php
@@ -361,6 +361,10 @@ class Courses_CourseModel extends Unl_Model
 
 	static public function findByCourseCode($subject, $courseNumber, $courseLetter = '')
 	{
+		if (!$courseLetter) {
+			$courseLetter = '';
+		}
+		
 		$db = Zend_Registry::get('db');
 
 		$select = new Zend_Db_Select($db);