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-rw-r--r--sphinx/ext/inheritance_diagram.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/ext/inheritance_diagram.py b/sphinx/ext/inheritance_diagram.py
index 29439f7cd..fba083bf4 100644
--- a/sphinx/ext/inheritance_diagram.py
+++ b/sphinx/ext/inheritance_diagram.py
@@ -85,7 +85,7 @@ class InheritanceGraph(object):
"""Import a class using its fully-qualified *name*."""
try:
path, base = class_sig_re.match(name).groups()
- except ValueError:
+ except (AttributeError, ValueError):
raise InheritanceException('Invalid class or module %r specified '
'for inheritance diagram' % name)