diff --git a/Helper/ProgressBar.php b/Helper/ProgressBar.php
index f4eec051c..b406292b4 100644
--- a/Helper/ProgressBar.php
+++ b/Helper/ProgressBar.php
@@ -183,9 +183,9 @@ public function setMessage(string $message, string $name = 'message'): void
         $this->messages[$name] = $message;
     }
 
-    public function getMessage(string $name = 'message'): string
+    public function getMessage(string $name = 'message'): ?string
     {
-        return $this->messages[$name];
+        return $this->messages[$name] ?? null;
     }
 
     public function getStartTime(): int