diff --git a/app/assets/javascripts/discourse/controllers/topic.js.es6 b/app/assets/javascripts/discourse/controllers/topic.js.es6
index 76acf375976..066b000a269 100644
--- a/app/assets/javascripts/discourse/controllers/topic.js.es6
+++ b/app/assets/javascripts/discourse/controllers/topic.js.es6
@@ -508,7 +508,7 @@ export default ObjectController.extend(SelectedPostsCount, BufferedContent, {
 
   canChangeOwner: function() {
     if (!Discourse.User.current() || !Discourse.User.current().admin) return false;
-    return !!this.get('selectedPostsUsername');
+    return this.get('selectedPostsUsername') !== undefined;
   }.property('selectedPostsUsername'),
 
   categories: function() {
diff --git a/app/assets/javascripts/discourse/mixins/selected-posts-count.js.es6 b/app/assets/javascripts/discourse/mixins/selected-posts-count.js.es6
index 31fd617b7ef..f4c17587b30 100644
--- a/app/assets/javascripts/discourse/mixins/selected-posts-count.js.es6
+++ b/app/assets/javascripts/discourse/mixins/selected-posts-count.js.es6
@@ -19,14 +19,16 @@ export default Em.Mixin.create({
   selectedPostsUsername: function() {
     // Don't proceed if replies are selected or usernames are mixed
     // Changing ownership in those cases normally doesn't make sense
-    if (this.get('selectedReplies') && this.get('selectedReplies').length > 0) { return; }
-    if (this.get('selectedPosts').length <= 0) { return; }
+    if (this.get('selectedReplies') && this.get('selectedReplies').length > 0) { return undefined; }
+    if (this.get('selectedPosts').length <= 0) { return undefined; }
 
     const selectedPosts = this.get('selectedPosts'),
           username = selectedPosts[0].username;
 
     if (selectedPosts.every(function(post) { return post.username === username; })) {
       return username;
+    } else {
+      return undefined;
     }
   }.property('selectedPosts.length', 'selectedReplies.length')
 });
diff --git a/app/services/post_owner_changer.rb b/app/services/post_owner_changer.rb
index 2776ebfa582..5ee2a47b663 100644
--- a/app/services/post_owner_changer.rb
+++ b/app/services/post_owner_changer.rb
@@ -2,7 +2,7 @@ class PostOwnerChanger
 
   def initialize(params)
     @post_ids = params[:post_ids]
-    @topic = Topic.find_by(id: params[:topic_id].to_i)
+    @topic = Topic.with_deleted.find_by(id: params[:topic_id].to_i)
     @new_owner = params[:new_owner]
     @acting_user = params[:acting_user]
 
@@ -12,7 +12,7 @@ class PostOwnerChanger
   def change_owner!
     ActiveRecord::Base.transaction do
       @post_ids.each do |post_id|
-        post = Post.find(post_id)
+        post = Post.with_deleted.find(post_id)
         @topic.user = @new_owner if post.is_first_post?
         post.set_owner(@new_owner, @acting_user)
       end