Object reference not set to an instance of an object

List<CustomImage> myDeserializedImageList =
(List<CustomImage>)Newtonsoft.Json.JsonConvert.DeserializeObject(images,
typeof(List<CustomImage>));
foreach (CustomImage element in myDeserializedImageList)
            {
                int SERVICE_NO = (int)element.SERVICE_NO;
                byte[] IMAGE = element.IMAGE;
                string sqlStatement = "INSERT INTO IMAGES (IMAGE_ID, SERVICE_NO, IMAGE ) VALUES ( IMG_ID_SEQ.nextval ,'" + SERVICE_NO + "', " + ":BlobParameter)";
                OracleParameter blobParameter = new OracleParameter();
                blobParameter.OracleDbType = OracleDbType.Blob;
                blobParameter.ParameterName = "BlobParameter";
                blobParameter.Value = IMAGE;
                cmd.Parameters.Add(blobParameter);
                cmd.CommandText = sqlStatement;
                imgRowId = cmd.ExecuteNonQuery();
            }