TypeError: Cannot read property 'callback' of undefined

Question

my code

const providerWs = new ethers.providers.WebSocketProvider('quicknode wss provider');

providerWs.on('pending', async (txHash) => {
        try {
            const transaction = await providerWs.getTransaction(txHash);
            console.log(Date.now(), 'Listing', transaction?.blockNumber);
            if (transaction != null && transaction['data'].includes(MethodID2) && transaction['data'].includes(snipeId)
                || transaction != null && transaction['data'].includes(MethodID) && transaction['data'].includes(snipeId)) {
                console.log(Date.now(), 'Listing to our token', transaction?.blockNumber);
}
                

When I started to my code, mempool is working good but

1641227827544 Listing null
1641227828778 Listing null
1641228360201 Listing undefined

But, then listener is broken, although listener worked

/Users/user/Desktop/code/pance/node_modules/@ethersproject/providers/lib/websocket-provider.js:112 request.callback(null, result.result); ^

TypeError: Cannot read property 'callback' of undefined

I don't know why do I have an error.