diff --git a/.nvmrc b/.nvmrc
index 8351c19397..209e3ef4b6 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-14
+20
diff --git a/src/interface.spec.js b/src/interface.spec.js
index 3a130d8dbd..69a09f0d00 100644
--- a/src/interface.spec.js
+++ b/src/interface.spec.js
@@ -8,6 +8,11 @@ describe('interface', () => {
       expect(date).toBe(undefined);
     });
 
+    it('should return undefined if date is null', () => {
+      const date = parseDate(null);
+      expect(date).toBe(undefined);
+    });
+
     it('should accept UTC timestamp as argument', () => {
       const date = parseDate(1479832134398);
       expect(date.getTime()).toEqual(1479832134398);