Angular ng-select : selectedItems.map is not a function

Question

When I'm using ng-select in reactive form angular I get this error:

ERROR TypeError: selectedItems.map is not a function

I have 3 select the first two work very well but in this third one I get the error ! to map item i'm using the function (the ng-select is inside *ngFor) :

//for mappinig item : 
mapLabelValueBS(objet) {
return objet.map(data => {
 return {
   id: data,
   text: data.name
 }
})
}
//this is the one that is causing the problem
<ng-select 
  [allowClear]="true"                                                 
  [items]="mapLabelValueBS(filieres)"
  placeholder="Filière non sélectionné"                                             
  (selected)="selecteFiliere($event)"                                                     
  formControlName="filiere">
</ng-select>

the result in my page (when I click on the field it doubles itself) :

Answer 1

This error came while I was passing [items]="value" where the value was not an array, so please check if you are not passing non array element to items binding.