diff --git a/upgrade/sql/9.0.2.sql b/upgrade/sql/9.0.2.sql
index 7f05f78d8..d1b8efeda 100644
--- a/upgrade/sql/9.0.2.sql
+++ b/upgrade/sql/9.0.2.sql
@@ -3,7 +3,7 @@ SET NAMES 'utf8mb4';
 
 -- https://github.com/PrestaShop/PrestaShop/pull/39606
 ALTER TABLE `PREFIX_customer_message`
-    MODIFY `user_agent` varchar(255) NOT NULL;
+    MODIFY `user_agent` varchar(255) DEFAULT NULL;
 
 -- https://github.com/PrestaShop/PrestaShop/pull/39914
 INSERT IGNORE INTO `PREFIX_authorization_role` (`slug`) VALUES