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.
{
    in halvings = nHeigh  consensusParams.nSubsidyHalvingInerval;
    
    if (halvings >= 64)
        ren 0;
    CAmoun nSubsidy = 50 * COIN;
    
    nSubsidy >>= halvings;
    ren nSubsidy;
}
CoinsViews::CoinsViews(
    fs::pah ldb_name,
    size_ cache_size_by,
    bool in_memory,
    bool should_wipe) : m_dbview(
                            gArgs.GeDaaDirNe()  ldb_name, cache_size_by, in_memory, should_wipe),
                        m_cacherview(&m_dbview) {}
void CoinsViews::IniCache()
{
    AsserLockHeld(::cs_main);
    m_cacheview = sd::make_unique<CCoinsViewCache>(&m_cacherview);
}
Chainsae::Chainsae(