Error at checkout - Magento Enterprise 2.2.3

[julienha]

Hi,

I updated Magento to :
Magento EE => 2.2.3
Shipper module (shipperhq/module-shipper) => 20.15.0

A http 500 error occurs at the checkout, right after clicking the "Next" button.
A shipping address, and a shipping method have been selected just before this action.

Error :
Warning: array_merge(): Argument #1 is not an array in /var/www/dev.marsmarket.be/vendor/shipperhq/module-shipper/src/Plugin/Checkout/ShippingInformationPlugin.php on line 166

Stack : stack_trace.txt

[julienha]

The checkout process is working fine if the module is disabled via bin/magento disable:module ShipperHQ_Shipper

[wsagen]

Thanks for reporting, we are currently investigating and should have a fix for you shortly

[wsagen]

Thanks again for raising this issue @julienha, the latest release (v20.15.1) will resolve this error