FIX: You need to be logged in to edit wiki posts.

app/assets/javascripts/discourse/controllers/topic.js.es6

@@ -144,6 +144,10 @@ export default ObjectController.extend(Discourse.SelectedPostsCount, {
     },
 
     editPost: function(post) {
+      if (!Discourse.User.current()) {
+        return bootbox.alert(I18n.t('post.controls.edit_anonymous'));
+      }
+
       this.get('controllers.composer').open({
         post: post,
         action: Discourse.Composer.EDIT,

config/locales/client.en.yml

@@ -1075,6 +1075,7 @@ en:
         has_liked: "you've liked this post"
         undo_like: "undo like"
         edit: "edit this post"
+        edit_anonymous: "Sorry, but you need to be logged in to edit this post."
         flag: "privately flag this post for attention or send a private notification about it"
         delete: "delete this post"
         undelete: "undelete this post"