When previewing a product with variants it throws an error.

[simeon-smith]

Description
When I preview a product I get the following error:

Argument 1 passed to craft\commerce\services\PaymentCurrencies::convert() must be of the type float, null given, called in /nitro/sites/site/craft/vendor/craftcms/commerce/src/helpers/Currency.php on line 82

This does not happen when I view the page directly. Only in the preview pane even with no differences between the live page and the "draft". I think it may be related to the commerceCurrency filter. This doesn't appear to happen with a product that doesn't have variants.

To Reproduce
How, and what happened?

1. Preview a product with variants in the CMS.
2. Preview won't load.
3. Preview throws error above.

Expected behavior
What did you expect to happen?
The preview should load just like the live page does.

Additional info

• Craft version: 3.4.27
• Commerce version: 3.1.11
• PHP version: 7.4
• Database driver & version: MySQL 8.0.20
• Other Plugins & versions:

[lukeholder]

Thanks for reporting that! I’ve just fixed it for the next release in e0bf5f0.

To get the fix early, change your craftcms/commerce requirement in composer.json to:

"require": {
  "craftcms/commerce": "dev-develop#e0bf5f0f90a31eb067b3b4fcbd0b6a3343b472f1 as 3.1.11",
  "...": "..."
}

Then run composer update.