diff --git a/src/plugin/objectSupport/index.js b/src/plugin/objectSupport/index.js
index 650166606..bd32358e9 100644
--- a/src/plugin/objectSupport/index.js
+++ b/src/plugin/objectSupport/index.js
@@ -1,6 +1,6 @@
 export default (o, c, dayjs) => {
   const proto = c.prototype
-  const isObject = obj => !(obj instanceof Date) && !(obj instanceof Array)
+  const isObject = obj => obj !== null && !(obj instanceof Date) && !(obj instanceof Array)
         && !proto.$utils().u(obj) && (obj.constructor.name === 'Object')
   const prettyUnit = (u) => {
     const unit = proto.$utils().p(u)
diff --git a/test/plugin/objectSupport.test.js b/test/plugin/objectSupport.test.js
index 06b10f9dc..7e20200b3 100755
--- a/test/plugin/objectSupport.test.js
+++ b/test/plugin/objectSupport.test.js
@@ -384,3 +384,11 @@ it('add decimal values of days and months', () => {
   expect(dayjs([2016, 7, 1]).add(1.6, 'years').format('YYYY-MM-DD')).toBe('2017-07-01')
   expect(dayjs([2016, 1, 1]).add(1.1, 'quarters').format('YYYY-MM-DD')).toBe('2016-04-01')
 })
+
+it('returns valid date on undefined', () => {
+  expect(dayjs().isValid()).toBe(true)
+})
+
+it('returns invalid date on null', () => {
+  expect(dayjs(null).isValid()).toBe(false)
+})