1 files changed, 11 insertions, 11 deletions
diff --git a/js/lib/node.js b/js/lib/node.js
index e58c7c7..c90c3e9 100644
--- a/js/lib/node.js
+++ b/js/lib/node.js
@@ -72,17 +72,17 @@ var Node = function(nodeType, sourcepos) {
     this.sourcepos = sourcepos;
     this.last_line_blank = false;
     this.open = true;
-    this.strings = undefined;
-    this.string_content = undefined;
-    this.literal = undefined;
-    this.list_data = undefined;
-    this.info = undefined;
-    this.destination = undefined;
-    this.title = undefined;
-    this.fence_char = undefined;
-    this.fence_length = undefined;
-    this.fence_offset = undefined;
-    this.level = undefined;
+    this.strings = null;
+    this.string_content = null;
+    this.literal = null;
+    this.list_data = null;
+    this.info = null;
+    this.destination = null;
+    this.title = null;
+    this.fence_char = null;
+    this.fence_length = null;
+    this.fence_offset = null;
+    this.level = null;
 };
 
 Node.prototype.isContainer = function() {