Use json_encode instead of addslashes

main/exercice/exercise_submit.php

@@ -684,7 +684,7 @@ if (!empty($objExercise->description)) {
                 changestart: function(event, ui) {
                     //var clicked = $(this).find('.ui-state-active').attr('id');
                     //$('#'+clicked).load('/widgets/'+clicked);
-                    $('#collapse1').html('".addslashes($objExercise->description)."');
+                    $('#collapse1').html(".json_encode($objExercise->description).");
                 }
             });
          });