diff --git a/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php b/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
index 73e517153383..19aefbc170f9 100644
--- a/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
+++ b/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php
@@ -59,6 +59,12 @@ public function bootstrap(Application $app)
      */
     protected function loadConfigurationFiles(Application $app, RepositoryContract $repository)
     {
+        $files = $this->getConfigurationFiles($app);
+
+        if (! isset($files['app'])) {
+            throw new \Exception('Unable to load the config/app.php file.');
+        }
+
         foreach ($this->getConfigurationFiles($app) as $key => $path) {
             $repository->set($key, require $path);
         }
diff --git a/src/Illuminate/Foundation/Exceptions/Handler.php b/src/Illuminate/Foundation/Exceptions/Handler.php
index da6011c0359a..f8da3961e08a 100644
--- a/src/Illuminate/Foundation/Exceptions/Handler.php
+++ b/src/Illuminate/Foundation/Exceptions/Handler.php
@@ -208,7 +208,7 @@ protected function convertExceptionToResponse(Exception $e)
     {
         $e = FlattenException::create($e);
 
-        $handler = new SymfonyExceptionHandler(config('app.debug'));
+        $handler = new SymfonyExceptionHandler(config('app.debug', true));
 
         return SymfonyResponse::create($handler->getHtml($e), $e->getStatusCode(), $e->getHeaders());
     }
diff --git a/src/Illuminate/Log/LogServiceProvider.php b/src/Illuminate/Log/LogServiceProvider.php
index 065eaae28add..a927dbf98901 100644
--- a/src/Illuminate/Log/LogServiceProvider.php
+++ b/src/Illuminate/Log/LogServiceProvider.php
@@ -118,7 +118,7 @@ protected function configureErrorlogHandler(Writer $log)
     protected function handler()
     {
         if ($this->app->bound('config')) {
-            return $this->app->make('config')->get('app.log');
+            return $this->app->make('config')->get('app.log', 'single');
         }
 
         return 'single';