diff --git a/LeStorage/Services.swift b/LeStorage/Services.swift
index 88a7a85..41a3fc5 100644
--- a/LeStorage/Services.swift
+++ b/LeStorage/Services.swift
@@ -741,7 +741,8 @@ struct BatchResponse<T: Decodable>: Decodable {
 struct OperationResult<T: Decodable>: Decodable {
     var apiCallId: String
     var status: Int
-    var data: T
+    var data: T?
+    var message: String?
 }
 
 struct ErrorMessage {