Error with footnote

[Marko Petersen]

Hi,
I often get the following error after changing some content of my docbook-XML
when I try to generate PDF:
[ERROR] null
org.apache.fop.apps.FOPException
        at 
org.apache.fop.apps.CommandLineStarter.run(CommandLineStarter.java:74)
        at org.apache.fop.apps.Fop.main(Fop.java:19)
---------
java.lang.NullPointerException
        at org.apache.fop.fo.flow.BasicLink.layout(BasicLink.java:94)
        at org.apache.fop.fo.flow.Block.layout(Block.java:206)
        at org.apache.fop.fo.flow.FootnoteBody.layout(FootnoteBody.java:73)
        at org.apache.fop.fo.flow.Footnote.layoutFootnote(Footnote.java:92)
        at org.apache.fop.layout.Page.setPendingFootnotes(Page.java:199)
        at 
org.apache.fop.fo.pagination.PageSequence.makePage(PageSequence.java:341)
        at 
org.apache.fop.fo.pagination.PageSequence.format(PageSequence.java:290)
        at org.apache.fop.apps.StreamRenderer.render(StreamRenderer.java:210)
        at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:177)

If I change the layout or the content, the message sometimes disappears.
Any ideas what the cause may be? Or is this error docbook-related and already
exists in the fo file?
Thanks,
Marko

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