Register ErrorHandler before Session start.

app.php

@@ -16,16 +16,15 @@ require_once 'vendor/autoload.php';
 Registry::set('start', microtime(true));
 Registry::set('db', new Database(DB_SERVER, DB_USER, DB_PASS, DB_NAME));
 
+// Handle errors our own way.
+ErrorHandler::enable();
+
 // Do some authentication checks.
 Session::start();
 $user = Authentication::isLoggedIn() ? Member::fromId($_SESSION['user_id']) : new Guest();
 $user->updateAccessTime();
 Registry::set('user', $user);
 
-// Handle errors our own way.
-set_error_handler('ErrorHandler::handleError');
-ini_set("display_errors", DEBUG ? "On" : "Off");
-
 // The real magic starts here!
 ob_start();
 Dispatcher::dispatch();