Error when using RootQueryToShopItemConnectionWhereArgsTaxArray as a variable

[vstrelianyi]

I'm receiving the following error while running the query with variables

"Type loader is expected to return a callable or valid type "RootQueryToShopItemConnectionWhereArgsTaxArray", but it returned null"

the query to reproduce the issue:

query GET_SHOP_ITEMS_BY_CATS_TAGS($taxArray: [RootQueryToShopItemConnectionWhereArgsTaxArray]) {
shop(
where: {status: PUBLISH, taxQuery: {relation: AND, taxArray: $taxArray}, }
) {
nodes {
title
databaseId
uri
}
}
}

query variables:
{
"taxArray": [{ "operator": "IN", "taxonomy": "SHOPCATEGORY", "terms": "grafika", "field": "SLUG"}]
}