diff --git a/Command/CheckMissingCommand.php b/Command/CheckMissingCommand.php
index e0162f1..9618e10 100644
--- a/Command/CheckMissingCommand.php
+++ b/Command/CheckMissingCommand.php
@@ -134,8 +134,8 @@ private function countEmptyTranslations(MessageCatalogueInterface $catalogue): i
         foreach ($catalogue->getDomains() as $domain) {
             $emptyTranslations = \array_filter(
                 $catalogue->all($domain),
-                function (string $message): bool {
-                    return '' === $message;
+                function (string $message = null): bool {
+                    return null === $message || '' === $message;
                 }
             );