Merge pull request #680 from cakephp/issue-671

Don't try to enable panels if service is disabled.

Author: dereuromark

src/Middleware/DebugKitMiddleware.php

@@ -50,6 +50,10 @@ public function __construct(?ToolbarService $service = null)
      */
     public function __invoke($request, $response, $next)
     {
+        if (!$this->service->isEnabled()) {
+            return $next($request, $response);
+        }
+
         $this->service->loadPanels();
         $this->service->initializePanels();
         $response = $next($request, $response);