Index: lams_common/src/java/org/lamsfoundation/lams/lesson/dao/hibernate/LessonDAO.java
===================================================================
diff -u -rc9c56707245e3ad1149bf1a5338eb251c96c75d2 -r7018be36a82c019346769f40ec232c4412bb4cf1
--- lams_common/src/java/org/lamsfoundation/lams/lesson/dao/hibernate/LessonDAO.java	(.../LessonDAO.java)	(revision c9c56707245e3ad1149bf1a5338eb251c96c75d2)
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/dao/hibernate/LessonDAO.java	(.../LessonDAO.java)	(revision 7018be36a82c019346769f40ec232c4412bb4cf1)
@@ -36,7 +36,7 @@
 					+ Lesson.class.getName()
 					+ " lesson where lesson.learningDesign.copyTypeID="
 					+ LearningDesign.COPY_TYPE_PREVIEW 
-					+ "and lesson.start_date_time < ?";
+					+ "and lesson.startDateTime is not null and lesson.startDateTime < ?";
 	
     /**
      * Retrieves the Lesson