Using Jomic 0.9.26:
java.lang.AssertionError
at net.sf.jomic.tools.ProgressFrame.getNormalizedProgress(ProgressFrame.java:132)
at net.sf.jomic.tools.ProgressFrame.setProgress(ProgressFrame.java:121)
at net.sf.jomic.tools.FileArchive.advanceProgress(FileArchive.java:336)
at net.sf.jomic.tools.FileArchive.extractZip(FileArchive.java:448)
at net.sf.jomic.tools.FileArchive.extract(FileArchive.java:248)
at net.sf.jomic.ui.JomicFrame.extractArchiveWithoutImages(JomicFrame.java:628)
at net.sf.jomic.ui.JomicFrame.fileToOpenFromArchiveWithoutImages(JomicFrame.java:650)
at net.sf.jomic.ui.JomicFrame.access$1300(JomicFrame.java:84)
at net.sf.jomic.ui.JomicFrame$OpenWorker.construct(JomicFrame.java:1140)
at net.sf.jomic.tools.SwingWorker$2.run(SwingWorker.java:51)
at java.lang.Thread.run(Thread.java:613)