We are intermittently receiving PDF generation mostly when the PDF being merged have logo or images like the one pasted below.

An error occurred while notifying Finance about an approved invoice.Error Message:Error while merging pdf : at iTextSharp.text.pdf.PdfReaderInstance.GetImportedPage(Int32 pageNumber) at OutSystems.NssPdfTools_UTIL.PdfUtility.MergePdf(List`1 pdfFiles, Byte[]& outPdfByte, String& errorMessage) at OutSystems.NssPdfTools_UTIL.CssPdfTools_UTIL.MssMergePdf(RLPdfFileRecordList sspdfFiles, Byte[]& ssoutPdfBinary, String& sserrorMessage)