diff --git a/app/assets/javascripts/app/lib/app_post/store.js.coffee b/app/assets/javascripts/app/lib/app_post/store.js.coffee
index cbab3ac62..a18b4e29a 100644
--- a/app/assets/javascripts/app/lib/app_post/store.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/store.js.coffee
@@ -58,7 +58,7 @@ class _Singleton
 
   # delete item
   delete: (key) ->
-    @store.delete key
+    delete @store[key]
     return if !@support
     localStorage.removeItem( key )