Unsupported operand types in commerce_license_billing_order_refresh()

Problem/Motivation

Webform to add membership product to cart fails. No memberships can be added or renewed.

Steps to reproduce

Site displays this Error: Unsupported operand types in commerce_license_billing_order_refresh() (line 735 of /???/profiles/commerce_kickstart/modules/contrib/commerce_license_billing/commerce_license_billing.module).
The website encountered an unexpected error. Please try again later.

Line 735 is
$data = $previous_price->data->value() + array('components' => array());

User selects menu item:
https://www.nacsw.org/sw/individual-membership-application
Completes required fields and selects desired membership rate.
Presses "Add to Cart"
Returns to https://www.nacsw.org/sw/individual-membership-application
but the Cart is empty

Proposed resolution

No resolution was found.
Error occurs with Commerce Kickstart 7.x-2.77, Commerce License Billing 7.x-1.0-beta4+13-dev, and after update to Commerce License Billing 7.x-1.0-beta4

Remaining tasks

User interface changes

API changes

Data model changes