Notice: Undefined index: rate in commerce_vat_commerce_line_item_rebase_unit_price() (line 535 of sites/all/modules/contrib/commerce_vat/commerce_vat.module).

When I run commerce_line_item_rebase_unit_price() for line item which already have some price components, I see:
Notice: Undefined index: rate in commerce_vat_commerce_line_item_rebase_unit_price() (line 535 of sites/all/modules/commerce_vat/commerce_vat.module).

I debug structure of $vat_rate in commerce_vat_commerce_line_item_rebase_unit_price function and I see that structure of $vat_rate not suitable for culculation.

[0] => Array
        (
            [title] => DE Standard
            [description] => 
            [rates] => Array
                (
                    [19_2007] => Array
                        (
                            [name] => 19_2007
                            [rate] => 0.19
                            [start] => 20070101
                        )

                )

            [country] => DE
            [rules_component] => commerce_vat_rate_de_standard
            [default_rules_component] => 1
            [price_component] => vat|de_standard
            [calculation_callback] => commerce_vat_rate_calculate
            [module] => commerce_eu_vat_de
            [eu] => 1
        )

It try to take $vat_rate['rate'] but not exists.