``` pdftk input1.pdf input2.pdf cat output output.pdf Unhandled Java Exception in create_output(): java.lang.ClassCastException: class pdftk.com.lowagie.text.pdf.PdfDictionary cannot be cast to class pdftk.com.lowagie.text.pdf.PdfArray (pdftk.com.lowagie.text.pdf.PdfDictionary and pdftk.com.lowagie.text.pdf.PdfArray are in unnamed module of loader 'app') at pdftk.com.lowagie.text.pdf.PdfCopy.addPage(PdfCopy.java:438) at com.gitlab.pdftk_java.TK_Session.create_output_page(TK_Session.java:2103) at com.gitlab.pdftk_java.TK_Session.create_output(TK_Session.java:2390) at com.gitlab.pdftk_java.pdftk.main_noexit(pdftk.java:156) at com.gitlab.pdftk_java.pdftk.main(pdftk.java:128) There was a problem with pdftk-java. Please report it at https://gitlab.com/pdftk-java/pdftk/issues including the message above, the version of pdftk-java (3.0.6), and if possible steps to reproduce the error. ``` I cannot provide sample PDFs for testing unfortunately. I assume all documents produced by "macOS Version 10.15.3 (Build 19D76) Quartz PDFContext, AppendMode 1.1" are affected.