WebSocket events: Cannot use 'in' operator to search for 'id' in iAA=

[kashirin-dm]

Ethers Version

6.1.3

Search Terms

WebSocketProvider, BSC

Describe the Problem

I'm getting this error when listening to pending transactions or events (I do not know for sure):

TypeError: Cannot use 'in' operator to search for 'id' in iAA=
    at WebSocketProvider._processMessage (/app/node_modules/ethers/src.ts/providers/provider-socket.ts:234:17)
    at WebSocketProvider.websocket.onmessage (/app/node_modules/ethers/src.ts/providers/provider-websocket.ts:55:18)
    at WebSocket.onMessage (/app/node_modules/ws/lib/event-target.js:199:18)
    at WebSocket.emit (node:events:513:28)
    at Receiver.receiverOnMessage (/app/node_modules/ws/lib/websocket.js:1137:20)
    at Receiver.emit (node:events:513:28)
    at Receiver.dataMessage (/app/node_modules/ws/lib/receiver.js:528:14)
    at Receiver.getData (/app/node_modules/ws/lib/receiver.js:446:17)
    at Receiver.startLoop (/app/node_modules/ws/lib/receiver.js:148:22)
    at Receiver._write (/app/node_modules/ws/lib/receiver.js:83:10)
[ERROR] 19:09:19 TypeError: Cannot use 'in' operator to search for 'id' in iAA=

Sorry, but I can't give more details.

Code Snippet

myWebsocketProvider.on({ topics: [ethers.id('event snippet')] }, async (event: ethers.Log) => {
    // Do something
}).catch((e) => console.error('fBorrow', e));

myWebsocketProvider.on('pending', async (tx: string) => {
    // Do something
}).catch((e) => console.error('fBorrow', e));

Contract ABI

No response

Errors

No response

Environment

node.js (v12 or newer), Geth, Parity

Environment (Other)

Docker

[kashirin-dm]

The problem with the ethers.IpcSocketProvider

[kashirin-dm]

Maybe the problem is related to WebSockets, but it recurs when I use an IPC provider in isolation, without WebSockets.
Also, I installed the latest version of ethers.js from the repository from the main branch and the problem repeats.

[kashirin-dm]

I forked the repository and made a hotfix in the src.ts/providers/provider-socket.ts file

if (typeof result === 'object' && 'id' in result) {
    // some code
}

[ricmoo]

Thanks! I can definitely include that fix too. But I’m curious what it is returning that isn’t an object?

[kashirin-dm]

I haven't checked to be honest. Most likely undefined or null.

[ricmoo]

I've added that check to the SocketProvider, in v6.4.0 and emit an error event when the message provided contains nonsense, to assist in debugging if similar problems crop up in the future.

Let me know if you continue having any problems.

Thanks! :)