1 files changed, 3 insertions, 1 deletions
diff --git a/js/lib/xml.js b/js/lib/xml.js
index 30b44c8..056bcc5 100644
--- a/js/lib/xml.js
+++ b/js/lib/xml.js
@@ -111,7 +111,9 @@ var renderNodes = function(block) {
                 }
                 break;
             case 'CodeBlock':
-                attrs.push(['info', node.info]);
+                if (node.info) {
+                    attrs.push(['info', node.info]);
+                }
                 break;
             case 'Header':
                 attrs.push(['level', String(node.level)]);