### Symfony version(s) affected symfony/console - 5.4.3 ### Description When `$message` is null, this line breaks and throws warning. https://github.com/symfony/console/blob/5.4/Formatter/OutputFormatter.php#L148 ### How to reproduce ```php <?php declare(strict_types = 1); use Symfony\Component\Console\Command\Command; use Symfony\Component\Console\Input\InputInterface; use Symfony\Component\Console\Output\OutputInterface; final class BrokenFormatterCommand extends Command { protected static $defaultName = 'broken-formatter'; /** * @param InputInterface $input * @param OutputInterface $output * * @return int */ protected function execute(InputInterface $input, OutputInterface $output): int { $output->writeln('ok'); // fails here $output->writeln(null); return 0; } } ``` ### Possible Solution Change affected line to: ```php preg_match_all("#<(($openTagRegex) | /($closeTagRegex)?)>#ix", $message ?? '', $matches, \PREG_OFFSET_CAPTURE); ``` ### Additional Context _No response_