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-rw-r--r--src/etc/htmldocck.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/etc/htmldocck.py b/src/etc/htmldocck.py
index a212e3a0435..2acee8a97f5 100644
--- a/src/etc/htmldocck.py
+++ b/src/etc/htmldocck.py
@@ -186,7 +186,8 @@ def concat_multi_lines(f):
 
         firstlineno = firstlineno or lineno
         if line.endswith('\\'):
-            lastline = line[:-1]
+            if lastline is None:
+                lastline = line[:-1]
             catenated += line[:-1]
         else:
             yield firstlineno, catenated + line