diff --git a/src/V4/DTO/Correction/Correction.php b/src/V4/DTO/Correction/Correction.php
index 00ccfbe..84e3064 100644
--- a/src/V4/DTO/Correction/Correction.php
+++ b/src/V4/DTO/Correction/Correction.php
@@ -119,7 +119,7 @@ public function setVats(array $vats): self
         return $this;
     }
 
-    public function getCashier(): string
+    public function getCashier(): ?string
     {
         return $this->cashier;
     }
diff --git a/src/V5/DTO/Correction/Correction.php b/src/V5/DTO/Correction/Correction.php
index fd89c96..343bc9a 100644
--- a/src/V5/DTO/Correction/Correction.php
+++ b/src/V5/DTO/Correction/Correction.php
@@ -204,7 +204,7 @@ public function setVats(array $vats): self
         return $this;
     }
 
-    public function getCashier(): string
+    public function getCashier(): ?string
     {
         return $this->cashier;
     }