diff --git a/index.html b/index.html
index 28fcd50..1064c4e 100644
--- a/index.html
+++ b/index.html
@@ -2,7 +2,7 @@
   <head>
     <title>Immutable DevTools Demo</title>
     <!-- <script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.7.6/immutable.min.js"></script> -->
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/4.0.0-rc.7/immutable.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/5.0.3/immutable.js"></script>
     <script src="dist/index.js"></script>
     <script id="demoScript">
       var MyRecord = Immutable.Record({
@@ -70,6 +70,7 @@
       })
       console.log('Nested Records', nestedRecords)
 
+      console.log("Null string", Immutable.List.of("hello", "null", null, 'undefined', undefined));
     </script>
   </head>
   <body>
diff --git a/src/createFormatters.js b/src/createFormatters.js
index 293138d..0eb82fe 100644
--- a/src/createFormatters.js
+++ b/src/createFormatters.js
@@ -34,7 +34,7 @@ export default function createFormatter(Immutable) {
   const reference = (object, config) => {
     if (typeof object === 'undefined')
       return ['span', nullStyle, 'undefined'];
-    else if (object === 'null')
+    else if (object === null)
       return ['span', nullStyle, 'null'];
 
     return ['object', {object, config}];
