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Fix #322

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This commit is contained in:
Kovid Goyal 2007-11-27 16:39:09 +00:00
parent 2a52852208
commit 5d7ef03701
1 changed files with 1 additions and 1 deletions
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2
src/libprs500/ebooks/metadata/opf.py
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@ -185,7 +185,7 @@ class OPFReader(MetaInformation):
scheme = item.get('scheme')
if not scheme:
scheme = item.get('opf:scheme')
if scheme.lower() == 'isbn':
if scheme is not None and scheme.lower() == 'isbn':
return item.string
return None