Fix #322

2026-06-07 22:45:32 -04:00 · 2007-11-27 16:39:09 +00:00
parent 2a52852208
commit 5d7ef03701
1 changed files with 1 additions and 1 deletions
@@ -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