diff --git a/400-SOURCECODE/AIAHTML5.Web/app/controllers/LabExercController.js b/400-SOURCECODE/AIAHTML5.Web/app/controllers/LabExercController.js
index c22a45f..6d81b4a 100644
--- a/400-SOURCECODE/AIAHTML5.Web/app/controllers/LabExercController.js
+++ b/400-SOURCECODE/AIAHTML5.Web/app/controllers/LabExercController.js
@@ -1067,8 +1067,11 @@ function ($scope, $rootScope, pages, log, $http, $timeout, DataService, $filter,
                         for (var j = 0; j < blocks.length; j++) {
 
                             if ((blocks[j].innerHTML).toString() == lastQuestionAnswers[i]) {
-                                $('#' + blocks[j].id).css("display", "none");
-                                break;
+                                if ($('#' + blocks[j].id).css('display').toLowerCase() == 'block') {
+                                    $('#' + blocks[j].id).css("display", "none");
+                                    break;
+                                }
+                                
                             };
                             
                         }