Angular 4: setValue formBuilder empty array

I have such reactive form:

constructor(...){
  this.form = this.formBuilder.group({
    name: ['', Validators.compose([Validators.required, Validators.maxLength(50)])],
    memes: this.formBuilder.array([
      this.initMemes('TrollFace')
    ])
  });
}

initMemes (name?) {
  return this.formBuilder.group({
    id: [''], name: [name]
  });
}

later i can add some more memes:

addMemes () {
  const control = <FormArray>this.form.controls['memes'];
  control.push(this.initMemes('anyName'));
}

and then if i get form values i get:

this.form.controls['memes'].value - here i have array

But there is a case, when i need this this.form.controls['memes'].value to set to an empty array, how is it possible to do?

If i set it this way:

this.form.controls['memes'].setValue([])

I got error: Must supply a value for form control at index: 0.

what i do wrong?