cypress check if element exist, throw exception when element not exist

I'm trying to get an indication of an element exists or not. if the element exists so I want to click on button X if not so click on button Y. but the problem is when the element does not exist it throws an exception and stop the test. part of my code

let elementKey = '#up-picker'
Cypress.get('body').then($res=>{
  if($res.find(elementKey).length>0){
   // click on button X
  }else{
    // click on button Y
  }
})

I have an element with this id, but sometimes because the logic in the UI can change. but it still not find me this element. I checked more posts in stack overflow and no answer works for me.