Merge cells does not work while creating pdf using PHPExcel - phpexcel

I am trying to create a PDF document using PHPexcel and mPDF as rendering engine.It generates an error "This PDF document might not be viewed correctly" when using the following code to merge cells.
$objPHPExcel->getActiveSheet()->mergeCells('A1:A3');
Has anybody experienced this error?
Simmy


Quick and Dirty fix;
Change line 1236 of PHPExcel/Writer/HTML.php, which reads:
$cssClass .= ' style' . $pSheet->getCell($endCellCoord)->getXfIndex();
to
if (!$this->_useInlineCss) {
$cssClass .= ' style' . $pSheet->getCell($endCellCoord)->getXfIndex();
}

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