diff --git a/src/Entity/Pokemon.php b/src/Entity/Pokemon.php
index 6ef97da..c8150bd 100644
--- a/src/Entity/Pokemon.php
+++ b/src/Entity/Pokemon.php
@@ -109,7 +109,7 @@ class Pokemon
     private $imageSize;
 
     /**
-     * @ORM\Column(type="datetime")
+     * @ORM\Column(type="datetime",nullable=true)
      *
      * @var \DateTimeInterface|null
      */