diff --git a/easy-coding-standard.neon b/easy-coding-standard.neon
index efe47699991..49710f25589 100644
--- a/easy-coding-standard.neon
+++ b/easy-coding-standard.neon
@@ -52,3 +52,7 @@ parameters:
         SlevomatCodingStandard\Sniffs\Classes\UnusedPrivateElementsSniff:
             # will be used soon
             - packages/NodeTypeResolver/src/TypeContext.php
+
+        PHP_CodeSniffer\Standards\Generic\Sniffs\Files\LineLengthSniff:
+            # long FQN classes that might not exist
+            - src/Rector/Contrib/Symfony/FrameworkBundleClassReplacementsRector.php
diff --git a/src/NodeVisitor/NodeConnector.php b/src/NodeVisitor/NodeConnector.php
index 76fa1bf614d..33138bc4457 100644
--- a/src/NodeVisitor/NodeConnector.php
+++ b/src/NodeVisitor/NodeConnector.php
@@ -13,7 +13,7 @@ final class NodeConnector extends NodeVisitorAbstract
     /**
      * @var Node
      */
-    private $stack;
+    private $stack = [];
 
     /**
      * @var Node
diff --git a/src/Rector/AbstractClassReplacerRector.php b/src/Rector/AbstractClassReplacerRector.php
new file mode 100644
index 00000000000..40702c5feab
--- /dev/null
+++ b/src/Rector/AbstractClassReplacerRector.php
@@ -0,0 +1,41 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Rector;
+
+use PhpParser\Node;
+use PhpParser\Node\Name;
+use PhpParser\Node\Name\FullyQualified;
+
+abstract class AbstractClassReplacerRector extends AbstractRector
+{
+    public function isCandidate(Node $node): bool
+    {
+        if (! $node instanceof Name) {
+            return false;
+        }
+
+        $fqnName = $node->toString();
+
+        return isset($this->getOldToNewClasses()[$fqnName]);
+    }
+
+    /**
+     * @param Name $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        $newName = $this->getNewName($node->toString());
+
+        return new FullyQualified($newName);
+    }
+
+    /**
+     * @return string[]
+     */
+    abstract protected function getOldToNewClasses(): array;
+
+    private function getNewName(string $oldName): string
+    {
+        return $this->getOldToNewClasses()[$oldName];
+    }
+}
diff --git a/src/Rector/Contrib/Symfony/FrameworkBundleClassReplacementsRector.php b/src/Rector/Contrib/Symfony/FrameworkBundleClassReplacementsRector.php
index ecc9f272ba6..cf0d4cc5970 100644
--- a/src/Rector/Contrib/Symfony/FrameworkBundleClassReplacementsRector.php
+++ b/src/Rector/Contrib/Symfony/FrameworkBundleClassReplacementsRector.php
@@ -2,21 +2,15 @@
 
 namespace Rector\Rector\Contrib\Symfony;
 
-use PhpParser\Node;
-use PhpParser\Node\Expr\MethodCall;
-use PhpParser\Node\Name;
-use PhpParser\Node\Name\FullyQualified;
 use Rector\Deprecation\SetNames;
-use Rector\Rector\AbstractRector;
+use Rector\Rector\AbstractClassReplacerRector;
 
 /**
  * Ref.: https://github.com/symfony/symfony/blob/master/UPGRADE-4.0.md#frameworkbundle
  *
  * FrameworkBundle classes replaced by new ones
- *
- * @todo extract AbstractClassReplacerRector
  */
-final class FrameworkBundleClassReplacementsRector extends AbstractRector
+final class FrameworkBundleClassReplacementsRector extends AbstractClassReplacerRector
 {
     public function getSetName(): string
     {
@@ -28,43 +22,13 @@ final class FrameworkBundleClassReplacementsRector extends AbstractRector
         return 4.0;
     }
 
-    public function isCandidate(Node $node): bool
-    {
-        if (! $node instanceof Name) {
-            return false;
-        }
-
-        $fqnName = $node->toString();
-
-        if (! isset($this->getOldClassToNewClassMap()[$fqnName])) {
-            return false;
-        }
-
-        return true;
-    }
-
     /**
-     * @param Name $node
+     * @return string[]
      */
-    public function refactor(Node $node): ?Node
-    {
-        $newName = $this->getNewName($node->toString());
-
-        return new FullyQualified($newName);
-    }
-
-    /**
-     * @var string[]
-     */
-    public function getOldClassToNewClassMap(): array
+    protected function getOldToNewClasses(): array
     {
         return [
-            'Symfony\Bundle\FrameworkBundle\DependencyInjectino\Compiler\SerializerPass' => 'Symfony\Component\Serializer\DependencyInjection\SerializerPass'
+            'Symfony\Bundle\FrameworkBundle\DependencyInjectino\Compiler\SerializerPass' => 'Symfony\Component\Serializer\DependencyInjection\SerializerPass',
         ];
     }
-
-    private function getNewName(string $oldName): string
-    {
-        return $this->getOldClassToNewClassMap()[$oldName];
-    }
 }