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-rw-r--r--bs4/__init__.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/bs4/__init__.py b/bs4/__init__.py
index d865bb9..bc611c9 100644
--- a/bs4/__init__.py
+++ b/bs4/__init__.py
@@ -242,7 +242,7 @@ class BeautifulSoup(Tag):
# Frequently a tree builder can't be pickled.
d = dict(self.__dict__)
if 'builder' in d and not self.builder.picklable:
- del d['builder']
+ d['builder'] = None
return d
@staticmethod