diff --git a/_tests/smoke.spec.js b/_tests/smoke.spec.js
index 29e6a4a..ca8d056 100644
--- a/_tests/smoke.spec.js
+++ b/_tests/smoke.spec.js
@@ -332,6 +332,14 @@ describe('proxy', () => {
     expect(proxyEqual(o1, o2, trapped.affected)).to.be.equal(false);
   });
 
+  it('handles orphan objects', () => {
+    const obj = Object.create(null);
+    obj.field=42;
+    const trapped = proxyState(obj);
+    expect(trapped.state.field).to.be.equal(42);
+    expect(trapped.affected).to.be.deep.equal(['.field']);
+  });
+
   it('detect self', () => {
     const A = {a: 1};
     const B = proxyState(A).state;
diff --git a/src/shouldInstrument.js b/src/shouldInstrument.js
index 8bc690d..f44cb41 100644
--- a/src/shouldInstrument.js
+++ b/src/shouldInstrument.js
@@ -36,6 +36,9 @@ const handlers = {
 const globalObj = typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : typeof window !== 'undefined' ? window : {};
 
 export function shouldInstrument({constructor}) {
+  if(!constructor) {
+    return true;
+  }
   const name = constructor.name;
   const isBuiltIn = (
     typeof constructor === 'function' &&
@@ -45,4 +48,4 @@ export function shouldInstrument({constructor}) {
   return !isBuiltIn || handlers.hasOwnProperty(name);
 }
 
-export const getCollectionHandlers = ({constructor}) => handlers[constructor.name];
+export const getCollectionHandlers = ({constructor}) => constructor && handlers[constructor.name];