diff --git a/chart/values.schema.json b/chart/values.schema.json
index 8bd29c0f6b7f9..757bb3699e770 100644
--- a/chart/values.schema.json
+++ b/chart/values.schema.json
@@ -5236,7 +5236,7 @@
                                 "string",
                                 "null"
                             ],
-                            "default": null
+                            "default": ""
                         },
                         "password": {
                             "description": "Password for the custom user to create.",
@@ -5244,7 +5244,7 @@
                                 "string",
                                 "null"
                             ],
-                            "default": null
+                            "default": ""
                         }
                     }
                 }
diff --git a/chart/values.yaml b/chart/values.yaml
index 339bcb844d902..cd9141a6b69b4 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -1707,8 +1707,8 @@ postgresql:
   auth:
     enablePostgresUser: true
     postgresPassword: postgres
-    username: ~
-    password: ~
+    username: ""
+    password: ""
 
 # Config settings to go into the mounted airflow.cfg
 #