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-rw-r--r--bs4/builder/_html5lib.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/bs4/builder/_html5lib.py b/bs4/builder/_html5lib.py
index ab5793c..8725a65 100644
--- a/bs4/builder/_html5lib.py
+++ b/bs4/builder/_html5lib.py
@@ -120,7 +120,10 @@ class AttrList(object):
if (name in list_attr['*']
or (self.element.name in list_attr
and name in list_attr[self.element.name])):
- value = whitespace_re.split(value)
+ # A node that is being cloned may have already undergone
+ # this procedure.
+ if not isinstance(value, list):
+ value = whitespace_re.split(value)
self.element[name] = value
def items(self):
return list(self.attrs.items())