diff --git a/src/main/resources/data.sql b/src/main/resources/data.sql
index 15cfe13..d64da16 100644
--- a/src/main/resources/data.sql
+++ b/src/main/resources/data.sql
@@ -1,6 +1,14 @@
 -- src/main/resources/data.sql
 #
---  INSERT INTO tb_role (id, name) VALUES (1, 'ROLE_USER');
---  INSERT INTO tb_role (id, name) VALUES (2, 'ROLE_MODERATOR');
---  INSERT INTO tb_role (id, name) VALUES (3, 'ROLE_ADMIN');
-#
+INSERT INTO tb_role (id, name)
+SELECT 1, 'ROLE_USER'
+WHERE NOT EXISTS (SELECT 1 FROM tb_role WHERE id = 1);
+
+INSERT INTO tb_role (id, name)
+SELECT 2, 'ROLE_MODERATOR'
+WHERE NOT EXISTS (SELECT 1 FROM tb_role WHERE id = 2);
+
+INSERT INTO tb_role (id, name)
+SELECT 3, 'ROLE_ADMIN'
+WHERE NOT EXISTS (SELECT 1 FROM tb_role WHERE id = 3);
+