Cannot read property 'indexOf' of undefined

[alhamdi23]

I have issue when have two dropdown list related to each other.
please check exmaple

https://stackblitz.com/edit/ng-select-example-ptfzwl

[varnastadeus]

Why are you using same property for NgModel and items input? It should be separate properties

[alhamdi23]

sorry
you are right. now its fixed.
the question is why after selecting primary and secondary and try to change the primary, the value of secondary not change to other list.

the scenario is
1- select primary
2- select secondry
3- try to change the primary
their is error message shown in the console
ERROR
Error: Cannot read property 'indexOf' of undefined

[varnastadeus]

fixed in #694, but you should use compareWith for it to work correctly