diff --git a/lib/post_creator.rb b/lib/post_creator.rb
index bb00ba335fb..1b41fef5aad 100644
--- a/lib/post_creator.rb
+++ b/lib/post_creator.rb
@@ -526,7 +526,9 @@ class PostCreator
 
     @user.user_stat.save!
 
-    @user.update(last_posted_at: @post.created_at)
+    if !@topic.private_message? && @post.post_type != Post.types[:whisper]
+      @user.update(last_posted_at: @post.created_at)
+    end
   end
 
   def create_post_notice
diff --git a/lib/tasks/import.rake b/lib/tasks/import.rake
index c0fbefed8f3..ca8fdc94866 100644
--- a/lib/tasks/import.rake
+++ b/lib/tasks/import.rake
@@ -384,12 +384,13 @@ end
 def update_users
   log "Updating users..."
 
-  DB.exec <<-SQL
+  DB.exec(<<~SQL, Archetype.private_message)
     WITH X AS (
-        SELECT user_id
-             , MIN(created_at) min_created_at
-             , MAX(created_at) max_created_at
-          FROM posts
+        SELECT p.user_id
+             , MIN(p.created_at) min_created_at
+             , MAX(p.created_at) max_created_at
+          FROM posts p
+          JOIN topics t ON t.id = p.topic_id AND t.archetype <> ?
          WHERE deleted_at IS NULL
       GROUP BY user_id
     )
diff --git a/spec/components/post_creator_spec.rb b/spec/components/post_creator_spec.rb
index c4decf5fa83..9dcb712723f 100644
--- a/spec/components/post_creator_spec.rb
+++ b/spec/components/post_creator_spec.rb
@@ -139,11 +139,10 @@ describe PostCreator do
         cat.save
 
         created_post = nil
-        reply = nil
 
         messages = MessageBus.track_publish do
           created_post = PostCreator.new(admin, basic_topic_params.merge(category: cat.id)).create
-          reply = PostCreator.new(admin, raw: "this is my test reply 123 testing", topic_id: created_post.topic_id).create
+          _reply = PostCreator.new(admin, raw: "this is my test reply 123 testing", topic_id: created_post.topic_id).create
         end
 
         # 2 for topic, one to notify of new topic another for tracking state
@@ -446,8 +445,8 @@ describe PostCreator do
             end
 
             it "creates missing tags if some exist" do
-              existing_tag1 = Fabricate(:tag, name: tag_names[0])
-              existing_tag1 = Fabricate(:tag, name: tag_names[1])
+              _existing_tag1 = Fabricate(:tag, name: tag_names[0])
+              _existing_tag1 = Fabricate(:tag, name: tag_names[1])
               expect { @post = creator_with_tags.create }.to change { Tag.count }.by(tag_names.size - 2)
               expect(@post.topic.tags.map(&:name).sort).to eq(tag_names.sort)
             end
@@ -483,9 +482,16 @@ describe PostCreator do
     fab!(:topic) { Fabricate(:topic, user: user) }
 
     it 'whispers do not mess up the public view' do
-      first = PostCreator.new(user,
+
+      freeze_time
+
+      first = PostCreator.new(
+        user,
         topic_id: topic.id,
-        raw: 'this is the first post').create
+        raw: 'this is the first post'
+      ).create
+
+      freeze_time 1.year.from_now
 
       user_stat = user.user_stat
 
@@ -512,6 +518,9 @@ describe PostCreator do
 
       expect(user_stat.reload.post_count).to eq(0)
 
+      user.reload
+      expect(user.last_posted_at).to eq_time(1.year.ago)
+
       # date is not precise enough in db
       whisper_reply.reload
 
@@ -742,6 +751,10 @@ describe PostCreator do
     end
 
     it 'acts correctly' do
+      freeze_time
+
+      user.update_columns(last_posted_at: 1.year.ago)
+
       # It's not a warning
       expect(post.topic.user_warning).to be_blank
 
@@ -760,6 +773,9 @@ describe PostCreator do
       expect(post.user.user_stat.post_count).to eq(0)
       expect(post.user.user_stat.topic_count).to eq(0)
 
+      user.reload
+      expect(user.last_posted_at).to eq_time(1.year.ago)
+
       # archive this message and ensure archive is cleared for all users on reply
       UserArchivedMessage.create(user_id: target_user2.id, topic_id: post.topic_id)