error handling with local Storage

index.html

@@ -119,12 +119,20 @@
 
         <script src="js/functions.js"></script>
         <script>
+            try {
                 closedTopics = JSON.parse(localStorage.getItem("closedTopics"))
+            } catch (e) {
+                closedTopics = []
+            }
             if(!closedTopics) {
                 closedTopics = []
             }
 
+            try{
                 actualTopic = JSON.parse(localStorage.getItem("actualTopic"))
+            } catch (e) {
+                initializeNewTopic()
+            }
             if(!actualTopic) {
                 initializeNewTopic()
             }