the command "bitcoin-cli getblockstats 0000000000000000000c61ff8f761ce509fc8901d3c22d61fec89637042ea2ba" does not work.

It displays "error: Error parsing JSON:0000000000000000000c61ff8f761ce509fc8901d3c22d61fec89637042ea2ba"

but it should display the block stats like the documentation says.

also bitcoin-cli getblockstats 0 does not work. block number must be at least 1 to work. But blocks start at 0.

tested with 0.20.1 on freebsd, another user on IRC acknowledged the problem.
}
    if (index_requested && g_coin_stats_index) {
        if (!g_coin_stats_index->BlockUntilSyncedToCurrentChain()) {
            const IndexSummary summary{g_coin_stats_index->GetSummary()};
            
            
            if (pindex->nHeight > summary.best_block_height) {
                throw JSONRPCError(RPC_INTERNAL_ERROR, strprintf("Unable to get data because coinstatsindex is still syncing. Current height: %d", summary.best_block_height));
            }
        }
    }
    const std::optional<CCoinsStats> maybe_stats = GetUTXOStats(coins_view, *blockman, hash_type, node.rpc_interruption_point, pindex, index_requested);
    if (maybe_stats.has_value()) {
        const CCoinsStats& stats = maybe_stats.value();
        ret.pushKV("height", (int64_t)stats.nHeight);
        ret.pushKV("bestblock", stats.hashBlock.GetHex());
        ret.pushKV("txouts", (int64_t)stats.nTransactionOutputs);
        ret.pushKV("bogosize", (int64_t)stats.nBogoSize);
        if (hash_type == CoinStatsHashType::HASH_SERIALIZED) {
            ret.pushKV("hash_serialized_2", stats.hashSerialized.GetHex());
        }
        if (hash_type == CoinStatsHashType::MUHASH) {
            ret.pushKV("muhash", stats.hashSerialized.GetHex());
        }
        CHECK_NONFATAL(stats.total_amount.has_value());
        ret.pushKV("total_amount", ValueFromAmount(stats.total_amount.value()));
        if (!stats.index_used) {
            ret.pushKV("transactions", static_cast<int64_t>(stats.nTransactions));
            ret.pushKV("disk_size", stats.nDiskSize);
        } else {