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java.lang.NullPointerException at com.itextpdf.text.pdf.StandardDecryption.finish(StandardDecryption.java:102) at com.itextpdf.text.pdf.PdfEncryption.decryptByteArray(PdfEncryption.java:776) at com.itextpdf.text.pdf.PdfReader.getStreamBytesRaw(PdfReader.java:2634) at com.itextpdf.text.pdf.PdfReader.getStreamBytesRaw(PdfReader.java:2650) at com.itextpdf.text.pdf.PRStream.toPdf(PRStream.java:230) at com.itextpdf.text.pdf.PdfIndirectObject.writeTo(PdfIndirectObject.java:158) at com.itextpdf.text.pdf.PdfWriter$PdfBody.write(PdfWriter.java:403) at com.itextpdf.text.pdf.PdfWriter$PdfBody.add(PdfWriter.java:381) at com.itextpdf.text.pdf.PdfWriter.addToBody(PdfWriter.java:870) at com.itextpdf.text.pdf.PdfStamperImp.close(PdfStamperImp.java:434) at com.itextpdf.text.pdf.PdfStamperImp.close(PdfStamperImp.java:409) at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:231)