diff --git a/src/Core/Framework/Migration/MigrationStep.php b/src/Core/Framework/Migration/MigrationStep.php
index fd4d9e69411..0ff52200654 100644
--- a/src/Core/Framework/Migration/MigrationStep.php
+++ b/src/Core/Framework/Migration/MigrationStep.php
@@ -97,8 +97,8 @@ protected function addTrigger(Connection $connection, string $name, string $tabl
      */
     protected function createTrigger(Connection $connection, string $query, array $params = []): void
     {
-        $blueGreenDeployment = (int) $_ENV['BLUE_GREEN_DEPLOYMENT'];
-        if ($blueGreenDeployment === 0) {
+        $blueGreenDeployment = $_ENV['BLUE_GREEN_DEPLOYMENT'] ?? false;
+        if ((int) $blueGreenDeployment === 0) {
             return;
         }