Fatal error when trying to run csex

When trying to export the latest site configuration by running drush csex -y I get a fatal error: Error: Undefined class constant 'DUMP_EXCEPTION_ON_INVALID_TYPE'.

Expected result: I expect csex to generate any modified configuration files for the site.

Full error:

Error: Undefined class constant 'DUMP_EXCEPTION_ON_INVALID_TYPE' in                                                  [error]
Drupal\Component\Serialization\YamlSymfony::encode() (line 22 of
/var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Component/Serialization/YamlSymfony.php) #0
/var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Component/Serialization/Yaml.php(27):
Drupal\Component\Serialization\YamlSymfony::encode(Array)
#1 /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Core/Config/FileStorage.php(199):
Drupal\Component\Serialization\Yaml::encode(Array)
#2 /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Core/Config/FileStorage.php(142):
Drupal\Core\Config\FileStorage->encode(Array)
#3 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_filter/src/Config/FilteredStorage.php(102):
Drupal\Core\Config\FileStorage->write('acsf.settings', Array)
#4 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/src/ConfigSplitCliService.php(301):
Drupal\config_filter\Config\FilteredStorage->write('acsf.settings', Array)
#5 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/src/ConfigSplitCliService.php(205):
Drupal\config_split\ConfigSplitCliService->export(Object(Drupal\config_filter\Config\FilteredStorage))
#6 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/config_split.drush.inc(49):
Drupal\config_split\ConfigSplitCliService->ioExport(NULL, Object(ConfigSplitDrush8Io), 'dt')
#7 phar:///usr/local/bin/drush/includes/command.inc(422): drush_config_split_export()
#8 phar:///usr/local/bin/drush/includes/command.inc(231): _drush_invoke_hooks(Array, Array)
#9 phar:///usr/local/bin/drush/includes/command.inc(199): drush_command()
#10 phar:///usr/local/bin/drush/lib/Drush/Boot/BaseBoot.php(67): drush_dispatch(Array)
#11 phar:///usr/local/bin/drush/includes/preflight.inc(66): Drush\Boot\BaseBoot->bootstrap_and_dispatch()
#12 phar:///usr/local/bin/drush/includes/startup.inc(458): drush_main()
#13 phar:///usr/local/bin/drush/includes/startup.inc(365): drush_run_main(false, '/', 'Phar detected. ...')
#14 phar:///usr/local/bin/drush/drush(114): drush_startup(Array)
#15 /usr/local/bin/drush(10): require('phar:///usr/loc...')
#16 {main}.
Error: Undefined class constant 'DUMP_EXCEPTION_ON_INVALID_TYPE' in /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Component/Serialization/YamlSymfony.php on line 22 #0 /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Component/Serialization/Yaml.php(27): Drupal\Component\Serialization\YamlSymfony::encode(Array)
#1 /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Core/Config/FileStorage.php(199): Drupal\Component\Serialization\Yaml::encode(Array)
#2 /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Core/Config/FileStorage.php(142): Drupal\Core\Config\FileStorage->encode(Array)
#3 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_filter/src/Config/FilteredStorage.php(102): Drupal\Core\Config\FileStorage->write('acsf.settings', Array)
#4 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/src/ConfigSplitCliService.php(301): Drupal\config_filter\Config\FilteredStorage->write('acsf.settings', Array)
#5 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/src/ConfigSplitCliService.php(205): Drupal\config_split\ConfigSplitCliService->export(Object(Drupal\config_filter\Config\FilteredStorage))
#6 /var/www/drupalvm/drupal/web/docroot/modules/contrib/config_split/config_split.drush.inc(49): Drupal\config_split\ConfigSplitCliService->ioExport(NULL, Object(ConfigSplitDrush8Io), 'dt')
#7 phar:///usr/local/bin/drush/includes/command.inc(422): drush_config_split_export()
#8 phar:///usr/local/bin/drush/includes/command.inc(231): _drush_invoke_hooks(Array, Array)
#9 phar:///usr/local/bin/drush/includes/command.inc(199): drush_command()
#10 phar:///usr/local/bin/drush/lib/Drush/Boot/BaseBoot.php(67): drush_dispatch(Array)
#11 phar:///usr/local/bin/drush/includes/preflight.inc(66): Drush\Boot\BaseBoot->bootstrap_and_dispatch()
#12 phar:///usr/local/bin/drush/includes/startup.inc(458): drush_main()
#13 phar:///usr/local/bin/drush/includes/startup.inc(365): drush_run_main(false, '/', 'Phar detected. ...')
#14 phar:///usr/local/bin/drush/drush(114): drush_startup(Array)
#15 /usr/local/bin/drush(10): require('phar:///usr/loc...')
#16 {main}
Error: Undefined class constant 'DUMP_EXCEPTION_ON_INVALID_TYPE' in Drupal\Component\Serialization\YamlSymfony::encode() (line 22 of /var/www/drupalvm/drupal/web/docroot/core/lib/Drupal/Component/Serialization/YamlSymfony.php).
Drush command terminated abnormally due to an unrecoverable error.                                                   [error]