There is line of code 'parsedKeyValuePdfDataparam = parsedKeyValuePdfData.ToDictionary(d => d.Key, d => d.Value);' in DocumentData.GetFormDetailsWithValues where possible exception is not handled. Now when parsedKeyValuePdfData has any duplicate column name, this method throws exception. Here if duplicate keys exist, then either that key should be skipped or value be overridden.