This wiki's custom standard_wiki_header method gave an error.

Traceback (most recent call last):
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/UI.py", line 150, in standard_wiki_header
    return self.folder().standard_wiki_header(self,REQUEST)
  File "/usr/local/Zope-2.6.2/lib/python/OFS/DTMLMethod.py", line 126, in __call__
    r=apply(HTML.__call__, (self, client, REQUEST), kw)
  File "/usr/local/Zope-2.6.2/lib/python/DocumentTemplate/DT_String.py", line 474, in __call__
    try: result = render_blocks(self._v_blocks, md)
  File "/usr/local/Zope-2.6.2/lib/python/DocumentTemplate/DT_Util.py", line 201, in eval
    return eval(code, d)
  File "", line 2, in f
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/Parents.py", line 133, in context
    nesting = self.ancestorsNesting()
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/Parents.py", line 615, in ancestorsNesting
    info = self.getWikiParentInfo()
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/Parents.py", line 678, in getWikiParentInfo
    for p in self.pages():
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/ZWikiPage.py", line 971, in pages
    for p in self.pageObjects(): results.append(self.metadataFor(p))
  File "/usr/local/Zope-2.6.2/lib/python/Products/ZWiki/ZWikiPage.py", line 2141, in metadataFor
    setattr(brain,attr,absattr(getattr(page,attr)))
AttributeError: category

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