Throwing errors in ember components

I was wondering what the best approach to throwing errors from components. In the following example I check if there an action passed and I throw an error to prevent further execution this works, however the error route is not triggered as I would of expected.

/**
         * Save step and go to the next step.
         */
        next() {
            if (isEmpty(this.get('nextAction'))) {
                throw new Error('The nextAction is undefined.');
            }
            if (isEmpty(this.get('saveAction'))) {
                throw new Error('The saveAction is undefined.');
            }
            const insuranceApplication = this.get('model');
            if (this.isLastDependent(this.get('dependentIndex'), insuranceApplication.get('dependents.length'))) {
                return this.get('nextAction')();
            }
            return this.get('saveAction')().then(() => {
                this.set('dependent', this.getNextDependent(insuranceApplication.get('dependents')));
            });
        }