diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 624a508ae..e4eafc8ac 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -744,7 +744,7 @@ defp restrict_replies(query, %{exclude_replies: true}) do
   end
 
   defp restrict_replies(query, %{
-         reply_filtering_user: user,
+         reply_filtering_user: %User{} = user,
          reply_visibility: "self"
        }) do
     from(
@@ -760,7 +760,7 @@ defp restrict_replies(query, %{
   end
 
   defp restrict_replies(query, %{
-         reply_filtering_user: user,
+         reply_filtering_user: %User{} = user,
          reply_visibility: "following"
        }) do
     from(
diff --git a/test/web/activity_pub/activity_pub_test.exs b/test/web/activity_pub/activity_pub_test.exs
index 03f968aaf..b579bb0bb 100644
--- a/test/web/activity_pub/activity_pub_test.exs
+++ b/test/web/activity_pub/activity_pub_test.exs
@@ -1773,6 +1773,14 @@ test "public timeline with default reply_visibility `self`", %{users: %{u1: user
         |> Enum.map(& &1.id)
 
       assert activities_ids == []
+
+      activities_ids =
+        %{}
+        |> Map.put(:reply_visibility, "self")
+        |> Map.put(:reply_filtering_user, nil)
+        |> ActivityPub.fetch_public_activities()
+
+      assert activities_ids == []
     end
 
     test "home timeline", %{users: %{u1: user}} do