diff --git a/framework/core/src/Core.php b/framework/core/src/Core.php
index 1c6aaa266..8772d1f27 100644
--- a/framework/core/src/Core.php
+++ b/framework/core/src/Core.php
@@ -9,7 +9,7 @@ class Core
 
     public static function inDebugMode()
     {
-        return app('flarum.config')['debug'];
+        return static::isInstalled() && app('flarum.config')['debug'];
     }
 
     public static function config($key, $default = null)
diff --git a/framework/core/src/Core/CoreServiceProvider.php b/framework/core/src/Core/CoreServiceProvider.php
index 97b44b589..28cf8f619 100644
--- a/framework/core/src/Core/CoreServiceProvider.php
+++ b/framework/core/src/Core/CoreServiceProvider.php
@@ -1,5 +1,6 @@
 <?php namespace Flarum\Core;
 
+use Flarum\Core;
 use Illuminate\Bus\Dispatcher as Bus;
 use Illuminate\Contracts\Container\Container;
 use Flarum\Support\ServiceProvider;
@@ -23,11 +24,13 @@ class CoreServiceProvider extends ServiceProvider
     {
         $this->loadViewsFrom(__DIR__.'/../../views', 'flarum');
 
-        $this->addEventHandlers();
-        $this->bootModels();
-        $this->addPostTypes();
-        $this->grantPermissions();
-        $this->mapCommandHandlers();
+        if (Core::isInstalled()) {
+            $this->addEventHandlers();
+            $this->bootModels();
+            $this->addPostTypes();
+            $this->grantPermissions();
+            $this->mapCommandHandlers();
+        }
     }
 
     public function mapCommandHandlers()