diff --git a/src/Entity/Poll.php b/src/Entity/Poll.php
index 0110d2b..5b3c39d 100755
--- a/src/Entity/Poll.php
+++ b/src/Entity/Poll.php
@@ -29,7 +29,7 @@ class Poll {
 	 */
 	public $title;
 	/**
-	 * @ORM\Column(type="string", length=255, nullable=true)
+	 * @ORM\Column(type="string", length=255, nullable=false, unique=true)
 	 * @Serializer\Expose()
 	 * @Serializer\Type("string")
 	 */