eth.filter.watch is returning null instead of data provided by Geth

[ethers]

Geth develop 4020258 and web3.js develop 271b00f

eth.filter.watch is returning null instead of data provided by Geth

Here's the data returned by Geth, which is correct:

I0417 14:44:02.366721    2668 api.go:42] eth_getFilterChanges ["0xa"]
I0417 14:44:02.366922    2668 http.go:114] Generated response: *rpc.RpcSuccessResponse &{%!s(float64=48) 2.0 [{0x50e4d8b5a5568bb8039f14ef990b3878c0984907 [0x000000000000000000000000cd2a3d9f938e13cd947ec05abc7fe734df8dd826] 0x0000000000000000000000000000000000000000000000000000000000000001 0x1ced9 0x0 0x59f55ebbd1a1cfddcee7221667c4fffce761105adc6fe8311e0064ef0473e420 0xd07e7d44b2741afa2ed29ff18d25a145b4c00a8a79179bc0bd3fdf038757a5b9 0x0}]}
I0417 14:44:02.367159    2668 http.go:125] Sending payload: [
    {
        "id": 48,
        "jsonrpc": "2.0",
        "result": [
            {
                "address": "0x50e4d8b5a5568bb8039f14ef990b3878c0984907",
                "topics": [
                    "0x000000000000000000000000cd2a3d9f938e13cd947ec05abc7fe734df8dd826"
                ],
                "data": "0x0000000000000000000000000000000000000000000000000000000000000001",
                "blockNumber": "0x1ced9",
                "logIndex": "0x0",
                "blockHash": "0x59f55ebbd1a1cfddcee7221667c4fffce761105adc6fe8311e0064ef0473e420",
                "transactionHash": "0xd07e7d44b2741afa2ed29ff18d25a145b4c00a8a79179bc0bd3fdf038757a5b9",
                "transactionIndex": "0x0"
            }
        ]
    }
]

Here's the JS:
gExchangeContractAddr is 0x50e4d8b5a5568bb8039f14ef990b3878c0984907

web3.eth.filter({'address': gExchangeContractAddr}).watch(function(res) {
  console.log(res)
});

In Chrome console, "null" is logged, instead of the data returned by Geth. Appears to be a regression as it worked several weeks ago.

[frozeman]

Thanks for the hint. Actually you need to provide an error first callback. Try:

web3.eth.filter({'address': gExchangeContractAddr}).watch(function(err, res) {
  console.log(res)
});

The docs are outdated, i will update those. Thanks for the hint.

[ethers]

thx 👍