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-rw-r--r--sphinx/util/nodes.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/nodes.py b/sphinx/util/nodes.py
index 65accbf2..acd2afe9 100644
--- a/sphinx/util/nodes.py
+++ b/sphinx/util/nodes.py
@@ -57,7 +57,7 @@ def extract_messages(doctree):
# https://sourceforge.net/tracker/?func=detail&aid=3599485&group_id=38414&atid=422032
if isinstance(node, nodes.caption) and not node.source:
node.source = node.parent.source
- node.line = '' #need fix docutils to get `node.line`
+ node.line = 0 #need fix docutils to get `node.line`
if not node.source:
continue # built-in message