Error while executing 'Remove discount price components' rules action.

Seems like there's a bug introduced while this fixing #2928286: Simplify order refresh logic.

Now in commerce_discount.rules.inc we have this method:

/**
 * Rules action: Remove discount components on product line items.
 */
function commerce_discount_remove_discount_components_on_products($line_item_wrapper) {
  commerce_discount_remove_discount_components($line_item_wrapper->commerce_unit_price, array('product_discount'));
  commerce_discount_remove_discount_components($line_item_wrapper->total, array('product_discount'));
}

It should probably be $line_item_wrapper->commerce_total as commerce line item entity doesn't usually have "total" property.

You can see error messages related to this issue if you have rules logs enabled.