Pleroma.Web.PleromaAPI.ChatController: Dialyzer errors

lib/pleroma/web/pleroma_api/controllers/chat_controller.ex:91:pattern_match
The pattern can never match the type.

Pattern:
{:reject, _message}

Type:
nil

________________________________________________________________________________
lib/pleroma/web/pleroma_api/controllers/chat_controller.ex:96:pattern_match
The pattern can never match the type.

Pattern:
{:error, _message}

Type:
nil

lib/pleroma/web/pleroma_api/controllers/chat_controller.ex

@@ -76,7 +76,7 @@ def post_chat_message(
         %{id: id}
       ) do
     with {:ok, chat} <- Chat.get_by_user_and_id(user, id),
-         %User{} = recipient <- User.get_cached_by_ap_id(chat.recipient),
+         {_, %User{} = recipient} <- {:user, User.get_cached_by_ap_id(chat.recipient)},
          {:ok, activity} <-
            CommonAPI.post_chat_message(user, recipient, params[:content],
              media_id: params[:media_id],
@@ -97,6 +97,11 @@ def post_chat_message(
         conn
         |> put_status(:bad_request)
         |> json(%{error: message})
+
+      {:user, nil} ->
+        conn
+        |> put_status(:bad_request)
+        |> json(%{error: "Recipient does not exist"})
     end
   end