importKeyImages throws error
I use monero-ts for "view only + offline" separated wallets, following [this instruction](https://github.com/woodser/monero-ts/blob/master/docs/developer_guide/view_only_offline.md). 
It works correctly until the wallet has a lot of transactions. But if I use a wallet with a few thousand transactions, process breaks with an error from `MoneroWalletFull.importKeyImages`:

> SyntaxError [Error]: Unexpected token e in JSON at position 0
> at JSON.parse (<anonymous>)
> at /app/node_modules/monero-ts/dist/src/main/ts/wallet/MoneroWalletFull.js:905:64

As I've understood, If I have more than a few thousand keyImages, the `importKeyImages` method gets error from monero-project, tries to deserialize the error as json and breaks with another error this line:
```
// import key images to view-only wallet
await viewOnlyWallet.importKeyImages(keyImages);
```
How can I import a large number of transactions into my view only wallet?