diff --git a/lib/freeze.js b/lib/freeze.js
index cd1ae6a..dd852a8 100644
--- a/lib/freeze.js
+++ b/lib/freeze.js
@@ -1,4 +1,6 @@
 function isFreezable(obj) {
+  if (obj === null) return false;
+
   return Array.isArray(obj) ||
     typeof obj === 'object';
 }
diff --git a/test/freeze.js b/test/freeze.js
index ca4a381..91c4d5f 100644
--- a/test/freeze.js
+++ b/test/freeze.js
@@ -50,4 +50,10 @@ describe('freeze', () => {
 
     expect(Object.isFrozen(obj)).to.be.false;
   });
+
+  it('handles null objects', () => {
+    const obj = { foo: null };
+    freeze(obj);
+    expect(Object.isFrozen(obj)).to.be.true;
+  });
 });