diff --git a/Helper/Data.php b/Helper/Data.php
index c2edaca..2beb5a0 100755
--- a/Helper/Data.php
+++ b/Helper/Data.php
@@ -93,6 +93,11 @@ public function getCacheFrontendPool()
 
     public function getQdbConfig($key, $scopeType = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeCode = null)
     {
+        // Backward compatibility
+        if($key=='handle_vardumper' && !class_exists(\Symfony\Component\VarDumper\VarDumper::class)) {
+            return false;
+        }
+
         return $this->getConfig('dev/quickdevbar/'.$key, $scopeType, $scopeCode);
     }
 
@@ -437,7 +442,7 @@ public function getIDELinkForClass($class)
                 return $this->getIDELinkForFile($file, 1, $class);
             }
 
-        } catch (\ReflectionException) {
+        } catch (\ReflectionException $e) {
 
         }
         return $class;
diff --git a/Observer/ControllerFrontSendResponseBeforeObserver.php b/Observer/ControllerFrontSendResponseBeforeObserver.php
index b1dda5d..30241a9 100644
--- a/Observer/ControllerFrontSendResponseBeforeObserver.php
+++ b/Observer/ControllerFrontSendResponseBeforeObserver.php
@@ -21,7 +21,7 @@ class ControllerFrontSendResponseBeforeObserver implements ObserverInterface
 
 
     public function __construct(\ADM\QuickDevBar\Helper\Register $qdbHelperRegister,
-                                Data $qdbHelper,)
+                                Data $qdbHelper)
     {
         $this->qdbHelperRegister = $qdbHelperRegister;
         $this->qdbHelper = $qdbHelper;
diff --git a/Plugin/Framework/App/FrontController.php b/Plugin/Framework/App/FrontController.php
index 142c512..9f7441a 100644
--- a/Plugin/Framework/App/FrontController.php
+++ b/Plugin/Framework/App/FrontController.php
@@ -6,10 +6,6 @@
 use ADM\QuickDevBar\Helper\Register;
 use ADM\QuickDevBar\Service\Dumper;
 use Magento\Framework\App\RequestInterface;
-use Symfony\Component\VarDumper\Dumper\HtmlDumper;
-use Symfony\Component\VarDumper\VarDumper;
-use Symfony\Component\VarDumper\Cloner\VarCloner;
-
 
 class FrontController
 {
@@ -63,7 +59,7 @@ public function beforeDispatch(\Magento\Framework\App\FrontControllerInterface $
             if($this->request->isAjax() && $enabledHandler<2) {
                 return;
             }
-            $prevHandler = VarDumper::setHandler($this->dumperHandler(...));
+            $prevHandler = \Symfony\Component\VarDumper\VarDumper::setHandler($this->dumperHandler(...));
         }
     }
 
@@ -73,8 +69,8 @@ public function beforeDispatch(\Magento\Framework\App\FrontControllerInterface $
      */
     protected function dumperHandler($var)
     {
-        $cloner = new VarCloner();
-        $dumper = new HtmlDumper();
+        $cloner = new \Symfony\Component\VarDumper\Cloner\VarCloner();
+        $dumper = new \Symfony\Component\VarDumper\Dumper\HtmlDumper();
 
         $dumper->setTheme('dark');
         $dumpBt = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS)[2];
diff --git a/view/base/templates/tab/dumper.phtml b/view/base/templates/tab/dumper.phtml
index 3e0166c..3e69f50 100644
--- a/view/base/templates/tab/dumper.phtml
+++ b/view/base/templates/tab/dumper.phtml
@@ -1,6 +1,11 @@
 <?php
 /** @var  $block \ADM\QuickDevBar\Block\Tab\Panel */
 ?>
+<?php if(!$block->getQdbConfig('handle_vardumper')):?>
+<p>You need to activate admin configuration and having VarDumper Component installed, see <a href="https://github.com/symfony/var-dumper">github.com/symfony/var-dumper</a></p>
+<?php endif; ?>
+
+
 
 <?php if(!$block->getDumps()): ?>
     <div class="qdb-dump"></div>