diff --git a/packages/shared/test/phantoms.test.ts b/packages/shared/test/phantoms.test.ts
index 881706c..98cd7d5 100644
--- a/packages/shared/test/phantoms.test.ts
+++ b/packages/shared/test/phantoms.test.ts
@@ -32,6 +32,7 @@ describe('deserializePhantoms', () => {
       zz: { color: 'b', type: 'p' },  // invalid square
       a1: { color: 'x', type: 'p' },  // invalid colour
       b2: { color: 'b', type: 'z' },  // invalid type
+      d3: null,                       // valid square, null value
     });
     expect(deserializePhantoms(raw)).toEqual({ e5: { color: 'b', type: 'n' } });
   });