NullPointerException when adding table to document

[KSchaeuble (at) netzgiganten.de]

I'm trying to piece a report together by creating several parts in 
different classes. I first ran this code locally and had no prblems 
creating the Pdf. When I now integrate it into my web-app and use a real 
object I'm getting an exception while generating the document:
I tried to hunt it down but now am rather clueless where else to look. I 
already checked that the text I'm getting from the object is ok.

This is the exception I'm getting: 
DocumentException: 
java.lang.NullPointerException
        at com.lowagie.text.pdf.PdfChunk.<init>(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.addWaitingPhrase(Unknown 
Source)
        at com.lowagie.text.pdf.ColumnText.go(Unknown Source)
        at com.lowagie.text.pdf.PdfPRow.calculateHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPRow.getMaxHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPTable.calculateHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPTable.setTotalWidth(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.goComposite(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.go(Unknown Source)
        at com.lowagie.text.pdf.PdfPRow.calculateHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPRow.getMaxHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPTable.calculateHeights(Unknown Source)
        at com.lowagie.text.pdf.PdfPTable.setTotalWidth(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.goComposite(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.go(Unknown Source)
        at com.lowagie.text.pdf.ColumnText.go(Unknown Source)
        at com.lowagie.text.pdf.PdfDocument.addPTable(Unknown Source)
        at com.lowagie.text.pdf.PdfDocument.add(Unknown Source)
        at com.lowagie.text.Document.add(Unknown Source)
        at pmt.reporting.basereporting.ReportGenerator.generateReport(
ReportGenerator.java:57)

And this is where I add my table. The render-method returns a PdfPTable as 
expected:

List firstElements = builder.getFirstElements();
for (Iterator iter = firstElements.iterator(); iter.hasNext();) {
        ReportSection firstElement = (ReportSection) iter.next();
        PdfPTable table = new 
PdfPTable((PdfPTable)firstElement.render(style));
        document.add(table);
} 

I know my description is rather misty but maybe you can give me at least 
an idea where else to look.

Thanks a lot!
Karola

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