Replace checking DEBUG in constructor Profiler to checking PROFILER is it true.

util/profiler/Profiler.php

@@ -22,8 +22,8 @@ class Profiler
 
     private function __construct()
     {
-        if (Config::get('DEBUG') == false) {
-            throw new GeneralException('Need to turn on DEBUG before use.');
+        if (Config::get('PROFILER') == false) {
+            throw new GeneralException('Need to turn on PROFILER before use.');
         }
     }