Fix type-error;

js/app.js

@@ -20,7 +20,7 @@ const TimeTrack = {
             },
             tickets: [],
             archive: [],
-            trashed: null,
+            trashed: {},
             worktimeTracker: {
                 tracking: false,
                 number: 'Worktime',
@@ -369,7 +369,7 @@ const TimeTrack = {
         restoreTrashed() {
             let restoredTracker = null;
             Object.assign(restoredTracker, this.trashed);
-            this.trashed = null;
+            this.trashed = {};
 
             this.tickets.push(restoredTracker);
         },