diff --git a/lib/pleroma/language/language_detector.ex b/lib/pleroma/language/language_detector.ex
index 42d200a28..2efe22d5e 100644
--- a/lib/pleroma/language/language_detector.ex
+++ b/lib/pleroma/language/language_detector.ex
@@ -3,8 +3,17 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Language.LanguageDetector do
+  import Pleroma.EctoType.ActivityPub.ObjectValidators.LanguageCode,
+    only: [good_locale_code?: 1]
+
   @words_threshold 4
 
+  def configured? do
+    provider = get_provider()
+
+    !!provider and provider.configured?
+  end
+
   def missing_dependencies do
     provider = get_provider()
 
@@ -34,7 +43,12 @@ defmodule Pleroma.Language.LanguageDetector do
     if word_count < @words_threshold or !provider or !provider.configured? do
       nil
     else
-      provider.detect(text)
+      with language <- provider.detect(text),
+           true <- good_locale_code?(language) do
+        language
+      else
+        _ -> nil
+      end
     end
   end
 
diff --git a/lib/pleroma/web/mastodon_api/views/instance_view.ex b/lib/pleroma/web/mastodon_api/views/instance_view.ex
index d9cff1504..00ca06243 100644
--- a/lib/pleroma/web/mastodon_api/views/instance_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/instance_view.ex
@@ -146,7 +146,7 @@ defmodule Pleroma.Web.MastodonAPI.InstanceView do
       "pleroma:get:main/ostatus",
       "pleroma:group_actors",
       "pleroma:bookmark_folders",
-      if Config.get([Pleroma.Language.LanguageDetector, :provider]) do
+      if Pleroma.Language.LanguageDetector.configured?() do
         "pleroma:language_detection"
       end
     ]