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-rw-r--r--sphinx/versioning.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/sphinx/versioning.py b/sphinx/versioning.py
index 8d34802ef..22ecda60c 100644
--- a/sphinx/versioning.py
+++ b/sphinx/versioning.py
@@ -57,6 +57,9 @@ def merge_doctrees(old, new, condition):
if old_node is None:
new_nodes.append(new_node)
continue
+ if not getattr(old_node, 'uid', None):
+ # maybe config.gettext_uuid has been changed.
+ old_node.uid = uuid4().hex
if new_node is None:
old_nodes.append(old_node)
continue