PHP Error in Argument/ArgumentAdderRector with anonymous classes

[hernst42]

Subject	Details
Rector version	v0.5.16
PHP version	PHP 7.1
Full Command	docker run -it -v $(pwd):/project rector/rector:0.5.16 process --config=/project/rector.yaml --autoload-file /project/vendir/autoload.php --dry-run --debug /project/xml/Custom/debug/Example.php

Current Behaviour

[parsing] /project/xml/Custom/debug/Example.php
[refactoring] /project/xml/Custom/debug/Example.php
[applying] Rector\Rector\ClassMethod\AddReturnTypeDeclarationRector
[applying] Rector\Rector\Argument\ArgumentAdderRector
[applying] Rector\Rector\ClassMethod\AddReturnTypeDeclarationRector
[applying] Rector\Rector\Argument\ArgumentAdderRector

Fatal error: Uncaught TypeError: Argument 1 passed to Rector\Rector\AbstractRector::isObjectType() must implement interface PhpParser\Node, null given, called in /rector/src/Rector/Argument/ArgumentAdderRector.php on line 233 and defined in /rector/src/Rector/AbstractRector/NodeTypeResolverTrait.php:38
Stack trace:
#0 /rector/src/Rector/Argument/ArgumentAdderRector.php(233): Rector\Rector\AbstractRector->isObjectType(NULL, 'iwat_util_TaskI...')
#1 /rector/src/Rector/Argument/ArgumentAdderRector.php(108): Rector\Rector\Argument\ArgumentAdderRector->isObjectTypeMatch(Object(PhpParser\Node\Stmt\ClassMethod), 'iwat_util_TaskI...')
#2 /rector/src/Rector/AbstractRector.php(91): Rector\Rector\Argument\ArgumentAdderRector->refactor(Object(PhpParser\Node\Stmt\ClassMethod))
#3 /rector/vendor/nikic/php-parser/lib/PhpParser/NodeTraverser.php(200): Rector\Rector\AbstractRector->enterNode(Object(PhpParser\Node\Stmt\ClassMethod))
#4 /rector/vendor/nikic/php-parser/lib/PhpParser/NodeTraverser.php(114): PhpParser\NodeTraverser->traverseAr in /rector/src/Rector/AbstractRector/NodeTypeResolverTrait.php on line 38

rector.yaml

parameters:
  php_version_features: '7.1'

services:
  Rector\Rector\Argument\ArgumentAdderRector:
    iwat_util_TaskInterface:
      runTask:
        1:
          name: logger
          type: iwat_util_LoggerInterface

Minimal PHP Code Causing Issue

<?php declare(strict_types=1);
class Custom_Example
{
    public function __construct()
    {
        $x = new class()
        {
            public function hydrate($context, array $data, ViewObject $object) : ViewObject
            {
                return $object;
            }
        };
    }
}

Expected Behaviour

no error and no code chages

[TomasVotruba]

Thanks for great report! 👍