diff --git a/app/Http/Middleware/MeasureExecutionTime.php b/app/Http/Middleware/MeasureExecutionTime.php
index 0988a841..04ccef4d 100644
--- a/app/Http/Middleware/MeasureExecutionTime.php
+++ b/app/Http/Middleware/MeasureExecutionTime.php
@@ -21,6 +21,9 @@ class MeasureExecutionTime
     {
         // Get the response
         $response = $next($request);
+        if(!defined('LUMEN_START')) {
+            return $response;
+        }
 
         // Calculate execution time
         $executionTime = microtime(true) - LUMEN_START;
diff --git a/bootstrap/app.php b/bootstrap/app.php
index c210fa86..a76c1a0c 100755
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -11,7 +11,9 @@
 |
 */
 
-define('LUMEN_START', microtime(true));
+if(!defined('LUMEN_START')) {
+    define('LUMEN_START', microtime(true));
+}
 
 $app = new Illuminate\Foundation\Application(
     realpath(__DIR__.'/../')