diff --git a/common/ASC.Data.Backup.Core/Tasks/Data/TableInfo.cs b/common/ASC.Data.Backup.Core/Tasks/Data/TableInfo.cs
index 9f3b0b9d0c..583321739d 100644
--- a/common/ASC.Data.Backup.Core/Tasks/Data/TableInfo.cs
+++ b/common/ASC.Data.Backup.Core/Tasks/Data/TableInfo.cs
@@ -62,6 +62,7 @@ namespace ASC.Data.Backup.Tasks.Data
             IdColumn = idColumn;
             IdType = idType;
             TenantColumn = tenantColumn;
+            UserIDColumns = new string[0];
             DateColumns = new Dictionary<string, bool>();
             InsertMethod = InsertMethod.Insert;
         }