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diff --git a/lib/pleroma/web/o_auth/fallback_controller.ex b/lib/pleroma/web/o_auth/fallback_controller.ex
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+++ b/lib/pleroma/web/o_auth/fallback_controller.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.FallbackController do
+  use Pleroma.Web, :controller
+  alias Pleroma.Web.OAuth.OAuthController
+
+  def call(conn, {:register, :generic_error}) do
+    conn
+    |> put_status(:internal_server_error)
+    |> put_flash(
+      :error,
+      dgettext("errors", "Unknown error, please check the details and try again.")
+    )
+    |> OAuthController.registration_details(conn.params)
+  end
+
+  def call(conn, {:register, _error}) do
+    conn
+    |> put_status(:unauthorized)
+    |> put_flash(:error, dgettext("errors", "Invalid Username/Password"))
+    |> OAuthController.registration_details(conn.params)
+  end
+
+  def call(conn, _error) do
+    conn
+    |> put_status(:unauthorized)
+    |> put_flash(:error, dgettext("errors", "Invalid Username/Password"))
+    |> OAuthController.authorize(conn.params)
+  end
+end