diff --git a/tests/helpers/CMTest/library/CMTest/TestSuite.php b/tests/helpers/CMTest/library/CMTest/TestSuite.php
index 1490cf6e4..f570abc80 100644
--- a/tests/helpers/CMTest/library/CMTest/TestSuite.php
+++ b/tests/helpers/CMTest/library/CMTest/TestSuite.php
@@ -15,6 +15,9 @@ public function bootstrap() {
     }
 
     public function generateInternalConfig() {
+        if (isset(CM_Config::get()->CM_Class_Abstract->typesMaxValue)) {
+            return;
+        }
         $generator = new CM_Config_Generator();
         $config = new CM_Config_Node();
         $config->extendWithConfig($generator->getConfigClassTypes());