How to fix webdriverio error : TypeError: Cannot read property 'then' of null?

Question

Hi I am new to webdriverio, I getting bellow error, Cannot read property 'then' of null TypeError: Cannot read property 'then' of null

Here is my code

it('Test case - User Add', () => {
browser.setTimeout({ implicit: 3111 })
userManagement.UserManagementMenu.click()
userManagement.NewUserButton.click()
userManagement.FirstName.setValue('EntryGate')
userManagement.Username.setValue('EGTestuser1')
userManagement.LastName.setValue('EGTestuser1')
userManagement.EmailAddress.setValue('EGTestuser1@test.com')
userManagement.Password.setValue('password1')
userManagement.Role.click().then(function(){
    browser.keys('ArrowUp')
    browser.keys('Enter')
})
userManagement.SaveUser.click()
});

});

following few google searches I figured out I am not handling the promise in my code. can anybody correct my code

Answer 1

Official doc says

The then() method returns a Promise. It takes up to two arguments: callback functions for the success and failure cases of the Promise.

If you want to just perform click and some keyboard operation you can use below piece of code

 it('some description', () => {
      userManagement.Role.click();
      browser.keys('ArrowUp');
      browser.keys('Enter');
      userManagement.SaveUser.click();    
 }