select event updates previous value (v-model)

[riux]

<multiselect 
        v-model="contacts" 
       :multiple="true"
        label="name" 
        @select="selectItem"
        track-by="name" 
        :options="persons" 
        :loading="isLoading" 
        open-direction="bottom" 
        @search-change="searchContacto"
      ><multiselect/>


selectItem(){
 console.log(this.contacts) // print value before select. print : select op1, print [], select op2 print [op1], ...
}