diff --git a/DependencyInjection/AddConsoleCommandPass.php b/DependencyInjection/AddConsoleCommandPass.php
index c55c5db4e..1fbb212e7 100644
--- a/DependencyInjection/AddConsoleCommandPass.php
+++ b/DependencyInjection/AddConsoleCommandPass.php
@@ -124,7 +124,7 @@ public function process(ContainerBuilder $container)
                 if (!$r->isSubclassOf(Command::class)) {
                     throw new InvalidArgumentException(sprintf('The service "%s" tagged "%s" must be a subclass of "%s".', $id, $this->commandTag, Command::class));
                 }
-                $description = str_replace('%', '%%', $class::getDefaultDescription());
+                $description = str_replace('%', '%%', $class::getDefaultDescription() ?? '');
             }
 
             if ($description) {