From 9fe84007eca04e94429f146fa45e83b26bc9b842 Mon Sep 17 00:00:00 2001
From: Peter Adelmann <peter.adelmann@trilobit.de>
Date: Thu, 15 Jul 2021 11:25:28 +0200
Subject: [PATCH] add treebuilder version distinction

---
 src/DependencyInjection/Configuration.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 9bab2ca..7f8bd8a 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -22,8 +22,14 @@ class Configuration implements ConfigurationInterface
     public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder('trilobit_constants');
-        $treeBuilder
-            ->getRootNode()
+
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            $rootNode = $treeBuilder->root('trilobit_constants');
+        }
+
+        $rootNode
             ->children()
                 ->booleanNode('allow_html')
                     ->defaultValue(false)