malformed ZipEntry

[TomTasche]

we have 1000 crashes affecting 500 users in the last 30 days where ZipCoder.toString crashes with "java.lang.IllegalArgumentException: MALFORMED[1]"

java.util.zip.ZipCoder.toString (ZipCoder.java:65)
java.util.zip.ZipFile.getZipEntry (ZipFile.java:594)
java.util.zip.ZipFile.-wrap2 (ZipFile.java)
java.util.zip.ZipFile$ZipEntryIterator.next (ZipFile.java:552)
java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:527)
java.util.zip.ZipFile$ZipEntryIterator.nextElement (ZipFile.java:526)
at.stefl.commons.util.iterator.EnumerationIterator.next (EnumerationIterator.java:20)
at.stefl.opendocument.java.odf.LocatedOpenDocumentFile.getFileNames (LocatedOpenDocumentFile.java:54)
at.stefl.opendocument.java.odf.LocatedOpenDocumentFile.getRawFileStream (LocatedOpenDocumentFile.java:64)
at.stefl.opendocument.java.odf.OpenDocumentFile.getManifest (OpenDocumentFile.java:187)
at.stefl.opendocument.java.odf.EncryptionParameter.parseEncryptionParameters (EncryptionParameter.java:61)
at.stefl.opendocument.java.odf.OpenDocumentFile.isEncrypted (OpenDocumentFile.java:39)
at.tomtasche.reader.background.DocumentLoader.loadSync (DocumentLoader.java:207)
at.tomtasche.reader.background.DocumentLoader$1.run (DocumentLoader.java:104)
android.os.Handler.handleCallback (Handler.java:789)
android.os.Handler.dispatchMessage (Handler.java:98)
android.os.Looper.loop (Looper.java:164)
android.os.HandlerThread.run (HandlerThread.java:65)

could this be related to documents created for other languages? is there a way to know the correct encoding upfront?