Index: lams_common/src/java/org/lamsfoundation/lams/web/filter/AccessPermissionFilter.java
===================================================================
diff -u -rf2cb56ddf4b6c4256e0fb0cb2be42510f4ee430d -r5bcf50e398eb2eb30e78eb5bf1877fced394625e
--- lams_common/src/java/org/lamsfoundation/lams/web/filter/AccessPermissionFilter.java	(.../AccessPermissionFilter.java)	(revision f2cb56ddf4b6c4256e0fb0cb2be42510f4ee430d)
+++ lams_common/src/java/org/lamsfoundation/lams/web/filter/AccessPermissionFilter.java	(.../AccessPermissionFilter.java)	(revision 5bcf50e398eb2eb30e78eb5bf1877fced394625e)
@@ -196,14 +196,11 @@
 			Lesson lesson = null;
 
 			for (ToolActivity activity : activities) {
-			    ToolSession toolSession = getLamsCoreToolService().getToolSessionByLearner(user, activity);
-			    if (toolSession != null) {
-				lesson = toolSession.getLesson();
-				if ((lesson != null) && (lesson.getLessonClass() != null)
-					&& lesson.getLessonClass().isStaffMember(user)) {
-				    isStaffMember = true;
-				    break;
-				}
+			    // there should be just one lesson
+			    lesson = (Lesson) activity.getLearningDesign().getLessons().iterator().next();
+			    if ((lesson.getLessonClass() != null) && lesson.getLessonClass().isStaffMember(user)) {
+				isStaffMember = true;
+				break;
 			    }
 			}