phpactor: crash about 7.2 polyfill

After the latest :call phpactor#Update(), I get

Phpactor returned an error: PHP Fatal error:  Uncaught Symfony\Component\Debug\Exception\ClassNotFoundException: Attempted to load class "Php72" from namespace "Symfony\Polyfill\Php72".
Did you forget a "use" statement for "Symfony\Polyfill\Php72\Php72"? in /home/gparis/workspace/svod/vendor/symfony/polyfill-php72/bootstrap.php:29
Stack trace:
#0 /home/gparis/workspace/svod/vendor/composer/autoload_real.php(66): require()
#1 /home/gparis/workspace/svod/vendor/composer/autoload_real.php(56): composerRequire2c154290397a11c6eb9d2f8ebc7d3da0('25072dd6e247008...', '/home/gparis/wo...')
#2 /home/gparis/workspace/svod/vendor/autoload.php(7): ComposerAutoloaderInit2c154290397a11c6eb9d2f8ebc7d3da0::getLoader()
#3 /home/gparis/.vim/bundle/phpactor/lib/Container/CoreExtension.php(249): require('/home/gparis/wo...')
#4 /home/gparis/.vim/bundle/phpactor/vendor/phpbench/container/lib/Container.php(118): Phpactor\Container\CoreExtension->Phpactor\Container\{closure}(Object(Phpactor\Container\ApplicationCont
ainer))
#5 /home/gparis/.vim/bundle/phpactor/lib/Container/Core in /home/gparis/workspace/svod/vendor/symfony/polyfill-php72/bootstrap.php on line 29