Error "MetaMask - RPC Error: results is not defined" appeared in none changed code

Question

My app was working without errors with Metamask and Smart Chain - Testnet. Nothing was changed but now I receive MetaMask - RPC Error: results is not defined when trying to use the getFilterLogs method.

More precisely, I use TruffleContract, and this method calls when I use a .allEvents.get() method of the instance of the contract. Whole variables are defined.

      // Get the smart contract data
      $.getJSON("../contracts/CryptoLife.json", function (data) {

        // Instance a new truffle contract from the artifact
        App.contracts.CryptoLife = TruffleContract(data);
          
        //Connect provider to interact with the contract
        App.contracts.CryptoLife.setProvider(App.web3Provider);

        // Log the step finish text
        console.log('--- Contract initiated ---');

        // Go to the next step
        return App.initAccount();

      });  

The contract is deployed.

    // Deploy the contract
    App.contracts.CryptoLife.deployed().then(function(instance){

        // Set a contract instance
        App.cryptoLife = instance;

        // Log the step finished text
        console.log('--- Contract deployed ---');

        // Go to the next step
        return App.loadContractData();
    });

And then set the filter and try to get events.

    // Set the filter
    let allEvents = App.cryptoLife.allEvents({fromBlock: _startBlock,   toBlock: _endBlock});

    // Get events
    allEvents.get((_error, _events)=> { /*some code*/});

This code worked two weeks ago and I did nothing with it. Now it returns the error. This code calls a lot of times for different checked values of _startBlock and _endBlock - error all the time now. Can somebody help and say what's happened with this method of Metamask? I can't find anything on the official site.

The whole code of the app is too long (>3000 lines). I'll post it if it is necessary.

Truffle version 5.4.17

MetaMask version 10.4.1