diff --git a/lib/data/models/appconfig_model.dart b/lib/data/models/appconfig_model.dart
index 7a91df50d..7baecff06 100644
--- a/lib/data/models/appconfig_model.dart
+++ b/lib/data/models/appconfig_model.dart
@@ -76,9 +76,9 @@ class DBProduct {
   final int devicetype;
   final String devicename;
   final String scanuuid;
-  final String version;
-  final String updatedescription;
-  final String updatepackageaddress;
+  final String? version;
+  final String? updatedescription;
+  final String? updatepackageaddress;
 
   DBProduct({
     required this.id,
diff --git a/lib/data/models/appconfig_model.g.dart b/lib/data/models/appconfig_model.g.dart
index c83d063fb..b8e08075e 100644
--- a/lib/data/models/appconfig_model.g.dart
+++ b/lib/data/models/appconfig_model.g.dart
@@ -77,9 +77,9 @@ DBProduct _$DBProductFromJson(Map<String, dynamic> json) => DBProduct(
       devicename: json['devicename'] as String,
       devicetype: json['devicetype'] as int,
       scanuuid: json['scanuuid'] as String,
-      version: json['version'] as String,
-      updatedescription: json['updatedescription'] as String,
-      updatepackageaddress: json['updatepackageaddress'] as String,
+      version: json['version'] as String?,
+      updatedescription: json['updatedescription'] as String?,
+      updatepackageaddress: json['updatepackageaddress'] as String?,
     );
 
 Map<String, dynamic> _$DBProductToJson(DBProduct instance) => <String, dynamic>{