diff --git a/www/runtest.php b/www/runtest.php
index e23f197898..1dccbcd45d 100644
--- a/www/runtest.php
+++ b/www/runtest.php
@@ -681,7 +681,7 @@
     if (!empty($user_api_key)){
         $test['carbon_control'] = false;
     }
-    if( $test['carbon_control'] ){
+    if( isset($test['carbon_control']) && $test['carbon_control'] ){
         array_push($conditionalMetrics, "carbon-footprint");
     }
     $test['customMetrics'] = CustomMetricFiles::get($conditionalMetrics);