Fix #3754: HTML builder crashes if HTML theme appends own stylesheets

sphinx-doc · May 17, 2017 · 62614af · 62614af
1 parent be6d205
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diff --git a/CHANGES b/CHANGES
@@ -13,6 +13,8 @@ Features added
 Bugs fixed
 ----------
 
+* #3754: HTML builder crashes if HTML theme appends own stylesheets
+
 Testing
 --------
 

diff --git a/sphinx/builders/html.py b/sphinx/builders/html.py
@@ -121,6 +121,7 @@ def __iadd__(self, other):
                       RemovedInSphinx20Warning)
         for item in other:
             self.append(item)
+        return self
 
     def __add__(self, other):
         ret = CSSContainer(self)