diff --git a/src/Core/Listener/ExtensionValidator.php b/src/Core/Listener/ExtensionValidator.php
new file mode 100644
index 000000000..142004bfc
--- /dev/null
+++ b/src/Core/Listener/ExtensionValidator.php
@@ -0,0 +1,51 @@
+<?php
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Core\Listener;
+
+use Flarum\Event\ExtensionWillBeEnabled;
+use Flarum\Event\ExtensionWillBeDisabled;
+use Illuminate\Contracts\Events\Dispatcher;
+use Flarum\Http\Exception\MethodNotAllowedException;
+
+class ExtensionModificationValidator
+{
+    /**
+     * @param Dispatcher $events
+     */
+    public function subscribe(Dispatcher $events)
+    {
+        $events->listen(ExtensionWillBeEnabled::class, [$this, 'whenExtensionWillBeEnabled']);
+        $events->listen(ExtensionWillBeDisabled::class, [$this, 'whenExtensionWillBeDisabled']);
+    }
+
+    /**
+     * @param ExtensionWillBeEnabled $event
+     */
+    public function whenExtensionWillBeEnabled(ExtensionWillBeEnabled $event)
+    {
+        
+    }
+    
+    /**
+     * @param ExtensionWillBeDisabled $event
+     * @throws MethodNotAllowedException
+     */
+    public function whenExtensionWillBeDisabled(ExtensionWillBeDisabled $event)
+    {
+        if (in_array('flarum-locale', $event->extension->extra)) {
+            $default_locale = $this->app->make('flarum.settings')->get('default_locale');
+            $locale = array_get($event->extension->extra, 'flarum-locale.code');
+            if ($locale === $default_locale) {
+                throw new MethodNotAllowedException('You cannot remove all your language packs!');
+            }
+        }
+    }
+}