diff --git a/lib/jsdoc/src/walker.js b/lib/jsdoc/src/walker.js
index 1c1c6c30..8042ad41 100644
--- a/lib/jsdoc/src/walker.js
+++ b/lib/jsdoc/src/walker.js
@@ -76,7 +76,9 @@ walkers[Syntax.ArrowFunctionExpression] = function(node, parent, state, cb) {
     }
 
     for (i = 0, l = node.defaults.length; i < l; i++) {
-        cb(node.defaults[i], node, state);
+        if (node.defaults[i]) {
+            cb(node.defaults[i], node, state);
+        }
     }
 
     cb(node.body, node, state);