diff --git a/escodegen.js b/escodegen.js
index 54e7cfab..8e67489a 100644
--- a/escodegen.js
+++ b/escodegen.js
@@ -2308,7 +2308,7 @@
                 }
             }
 
-            if (expr.value === null) {
+            if (expr.value === null || (expr.raw === 'null' && expr.value===undefined)) {
                 return 'null';
             }