I have 2 legacy wallets and on both if I run `upgradewallet` it will cause bitcoin core to crash. This should just return me an error string

Currenl result from `getwalletinfo`:
```
{
  "walletname": "Wallet",
  "walletversion": 169900,
  "format": "bdb",
  "balance": 0.00000000,
  "unconfirmed_balance": 0.00000000,
  "immature_balance": 0.00000000,
  "txcount": 80,
  "keypoololdest": 1613078825,
  "keypoolsize": 941,
  "keypoolsize_hd_internal": 941,
  "paytxfee": 0.00000000,
  "private_keys_enabled": false,
  "avoid_reuse": true,
  "scanning": false,
  "descriptors": false
}
```
for (; mi != mapCryptedKeys.end(); ++mi)
        {
            const CPubKey &vchPubKey = (*mi).second.first;
            const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
            CKey key;
            if (!DecryptKey(master_key, vchCryptedSecret, vchPubKey, key))
            {
                keyFail = true;
                break;
            }
            keyPass = true;
            if (fDecryptionThoroughlyChecked)
                break;
            else {
                
                batch.WriteCryptedKey(vchPubKey, vchCryptedSecret, mapKeyMetadata[vchPubKey.GetID()]);
            }
        }
        if (keyPass && keyFail)
        {
            LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.\n");
            throw std::runtime_error("Error unlocking wallet: some keys decrypt but not all. Your wallet file may be corrupt.");
        }
        if (keyFail || (!keyPass && !accept_no_keys))
            return false;
        fDecryptionThoroughlyChecked = true;
    }
    return true;
}
bool LegacyScriptPubKeyMan::Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch)