JasperPrint.createReport returns null because of HTML Component

[papryk57]

Hello everybody.
I have a problem with create report.
I put report file from my database as byte array into createReport method,
everything was good  until I add the html component into jasper file. (earlier reports worked fine)

Now:
JasperPrint printableReport = createReport(report.getReportAsByteArray(), parameters, dataSource);
printableReport is null.

Have you any idea how to fill the html component?