NullPointerException when using TXT Renderer

[Ulrich Mayring]

Hello,
I'm using fop 0.20.4 and while the PDF and PS Renderer work fine, the 
TXT Renderer produces an exception on the same documents. Here is a 
stack-trace:

java.lang.NullPointerException
        at 
org.apache.batik.dom.svg.AbstractSVGAnimatedLength$BaseSVGLength$DefaultContext.getPixelToMM(Unknown 
Source)
        at org.apache.batik.util.UnitProcessor.svgToUserSpace(Unknown 
Source)
        at 
org.apache.batik.dom.svg.AbstractSVGAnimatedLength$BaseSVGLength.getValue(Unknown 
Source)
        at org.apache.fop.render.txt.TXTRenderer.renderSVGArea(Unknown 
Source)
        at org.apache.fop.svg.SVGArea.render(Unknown Source)
        at 
org.apache.fop.render.txt.TXTRenderer.renderForeignObjectArea(Unknown 
Source)
        at 
org.apache.fop.layout.inline.ForeignObjectArea.render(Unknown Source)
        at 
org.apache.fop.render.AbstractRenderer.renderAreaContainer(Unknown Source)
        at org.apache.fop.layout.AreaContainer.render(Unknown Source)
        at 
org.apache.fop.render.AbstractRenderer.renderAreaContainer(Unknown Source)
        at org.apache.fop.render.txt.TXTRenderer.renderPage(Unknown Source)
        at org.apache.fop.render.txt.TXTRenderer.render(Unknown Source)
        at org.apache.fop.apps.StreamRenderer.queuePage(Unknown Source)
        at org.apache.fop.layout.AreaTree.addPage(Unknown Source)
        at org.apache.fop.fo.pagination.PageSequence.format(Unknown Source)
        at org.apache.fop.apps.StreamRenderer.render(Unknown Source)
        at org.apache.fop.fo.FOTreeBuilder.endElement(Unknown Source)
        at 
org.apache.xalan.transformer.ResultTreeHandler.endElement(ResultTreeHandler.java:307)
        at 
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:684)
        at 
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:423)
        at 
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)
        at 
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2182)
        at 
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2008)
        at 
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1171)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:638)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1088)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1066)

I'm using the exact same code for rendering to all formats with the 
exception of this line:

driver.setRenderer(Driver.RENDER_TXT);
Is there anything special I have to do with my stylesheet or maybe it 
shouldn't contain SVG when using the TXT Renderer? I can provide test 
documents, if someone wants to research into this problem.

Would it make sense to try the newest release candidate or has nothing 
changed in the TXT Renderer?

Many thanks in advance for any pointers,
Ulrich

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