Transaction parameter for query outputs an empty list

[rogermas05]

query Account {
    account(id: "0x551e47c9f551d61c3b76a6676292b1906ec7b8bd", subgraphError: allow) {
        id
        creationTimestamp
        lastSeenTimestamp
        collateralVolume
        scaledCollateralVolume
        lastTradedTimestamp
        profit
        scaledProfit
        numTrades
        marketPositions {
            id
            quantityBought
            quantitySold
            netQuantity
            valueBought
            valueSold
            netValue
            feesPaid
            market {
                id
                priceOrderbook
                outcomeIndex
            }
        }
        transactions {
            id
            type
            timestamp
            tradeAmount
            feeAmount
            outcomeIndex
            outcomeTokensAmount
        }
    }
}

This example query returns an empty list for transactions ("transactions": []). How can this be solved?