highlighting: fix potential TypeError

tk0miya · Jan 6, 2015 · b9fe829 · b9fe829
1 parent 81313e9
commit b9fe829
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/sphinx/highlighting.py b/sphinx/highlighting.py
@@ -164,7 +164,7 @@ def highlight_block(self, source, lang, opts=None, warn=None, force=False, **kwa
                 lexer = lexers[lang]
             else:
                 try:
-                    lexer = lexers[lang] = get_lexer_by_name(lang, **opts)
+                    lexer = lexers[lang] = get_lexer_by_name(lang, **opts or {})
                 except ClassNotFound:
                     if warn:
                         warn('Pygments lexer name %r is not known' % lang)