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Sometimes in class
Rule/Design/RequestAwareBlockMethod
occur exception because of line:
$name = mb_strtolower($node->getFirstChildOfType('Identifier')->getImage());

It happen that $node->getFirstChildOfType('Identifier') is null which leads to:

PHP Fatal error: Uncaught Error: Call to a member function getImage() on null in /var/www/dev/tests/static/framework/Magento/CodeMessDetector/Rule/Design/RequestAwareBlockMethod.php:45 Stack trace: #0 /var/www/vendor/phpmd/phpmd/src/main/php/PHPMD/RuleSet.php(284): Magento\CodeMessDetector\Rule\Design\RequestAwareBlockMethod->apply(Object(PHPMD\Node\MethodNode)) #1 /var/www/vendor/phpmd/phpmd/src/main/php/PHPMD/Parser.php(288): PHPMD\RuleSet->apply(Object(PHPMD\Node\MethodNode)) #2 /var/www/vendor/phpmd/phpmd/src/main/php/PHPMD/Parser.php(263): PHPMD\Parser->apply(Object(PHPMD\Node\MethodNode)) #3 /var/www/vendor/pdepend/pdepend/src/main/php/PDepend/Source/AST/ASTMethod.php(218): PHPMD\Parser->visitMethod(Object(PDepend\Source\AST\ASTMethod)) #4 /var/www/vendor/pdepend/pdepend/src/main/php/PDepend/Source/ASTVisitor/AbstractASTVisitor.php(110): PDepend\Source\AST\ASTMethod->accept(Object(PHPMD\Parser)) #5 /var/www/vendor/phpmd/phpmd/src/main/php/PHPMD/Parser.php(217): PDepend\Source\ASTVisitor\AbstractASTVisitor->visitClass(Ob in /var/www/dev/tests/static/framework/Magento/CodeMessDetector/Rule/Design/RequestAwareBlockMethod.php on line 45