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-rw-r--r--markdown/extensions/admonition.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/markdown/extensions/admonition.py b/markdown/extensions/admonition.py
index 87d8ec8..76e0fb5 100644
--- a/markdown/extensions/admonition.py
+++ b/markdown/extensions/admonition.py
@@ -46,7 +46,7 @@ class AdmonitionProcessor(BlockProcessor):
def test(self, parent, block):
sibling = self.lastChild(parent)
return self.RE.search(block) or \
- (block.startswith(' ' * self.tab_length) and sibling and
+ (block.startswith(' ' * self.tab_length) and sibling is not None and
sibling.get('class', '').find(self.CLASSNAME) != -1)
def run(self, parent, blocks):