diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index a00d42f5..93645e65 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -609,7 +609,7 @@ class ConfigurationManager
             throw new InvalidSettingConfigurationException(DataConst::GetDataDirectory() . " does not exist! Something was set up falsely!");
         }
         $df = disk_free_space(DataConst::GetDataDirectory());
-        $content = json_encode($config, JSON_UNESCAPED_SLASHES|JSON_PRETTY_PRINT|JSON_THROW_ON_ERROR);
+        $content = json_encode($this->config, JSON_UNESCAPED_SLASHES|JSON_PRETTY_PRINT|JSON_THROW_ON_ERROR);
         $size = strlen($content) + 10240;
         if ($df !== false && (int)$df < $size) {
             throw new InvalidSettingConfigurationException(DataConst::GetDataDirectory() . " does not have enough space for writing the config file! Not writing it back!");