Composer require bug

gistfile1.sh

➜  pim git:(master) ✗ composer.phar --version
Composer version a023c7929aba08861bea56e9cb371b2d31a1eb5b 2014-04-10 13:28:36

➜  pim git:(master) ✗ composer.phar require foo/foo --no-update -v
Please provide a version constraint for the foo/foo requirement: dev-master


                                     
  [ErrorException]                   
  Undefined variable: childrenClean  
                                     


Exception trace:
 () at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Json/JsonManipulator.php:228
 Composer\Util\ErrorHandler::handle() at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Json/JsonManipulator.php:228
 Composer\Json\JsonManipulator->removeSubNode() at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Command/RequireCommand.php:154
 Composer\Command\RequireCommand->updateFileCleanly() at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Command/RequireCommand.php:95
 Composer\Command\RequireCommand->execute() at phar:///home/gildas/.local/bin/composer.phar/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:241
 Symfony\Component\Console\Command\Command->run() at phar:///home/gildas/.local/bin/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:892
 Symfony\Component\Console\Application->doRunCommand() at phar:///home/gildas/.local/bin/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:191
 Symfony\Component\Console\Application->doRun() at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Console/Application.php:117
 Composer\Console\Application->doRun() at phar:///home/gildas/.local/bin/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:121
 Symfony\Component\Console\Application->run() at phar:///home/gildas/.local/bin/composer.phar/src/Composer/Console/Application.php:83
 Composer\Console\Application->run() at phar:///home/gildas/.local/bin/composer.phar/bin/composer:43
 require() at /home/gildas/.local/bin/composer.phar:15


require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [packages1] ... [packagesN]