Uncaught TypeError: Cannot read property 'then' of undefined

[dev-ahmad]

@yyx990803 Good Evening :)

i am using uikit 3 in my Vue SSR project ! , i am facing this error , i tried hard to solve it ... i don't know why this error happened , it's happening only when i click to select and choose any option from it ,, can you help me !

here is my code

<div class="uk-margin">
          <div class="uk-inline uk-width-1-3">
            <label class="uk-text-small">Month</label>
            <select
              placeholder="Year"
              class="uk-select"
              v-model="birthday.year">
                <option value="2000">2000</option>
                <option value="2001">2001</option>
                <option value="2002">2003</option>
             </select>
          </div>
          <div class="uk-inline uk-width-1-3">
            <label class="uk-text-small">Day</label>
              <select
              placeholder="Year"
              class="uk-select"
              v-model="birthday.month">
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">4</option>
           </select>
          </div>
          <div class="uk-inline uk-width-1-3">
            <label class="uk-text-small">Year</label>
            <select
              placeholder="Day"
              v-model="birthday.day">
              <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">4</option>
           </select>
          </div>
</div>

here is the error

[JounQin]

No reproduction, no help. :)