Error when passing BigNumber to abi function errorName="Panic"

[defikintaro]

Hello,

I've faced an interesting error, when I try to pass a BigNumber to a contract's view function. My code basically is, I'm waiting for an Event(uint256) is thrown from the contract, get the uint256 as BigNumber then pass this BigNumber to contract's view function, and then get the data returned.
Environment: "ethers": "5.1.4", NodeJs v14.17.1

// works once on start
const filter = nft.filters.SomeEventFilter();
contract.on(filter, eventHandler );

const eventHandler = async (value) => {
  try {
    var bn_value = BigNumber.from(value);  // Is this legit : BigNumber to BigNumber ?
    const some_data = await contract.someViewFunction(bn_value);
  } catch (error) {
    console.log("ERROR at SomeFunc: ", error);
  }
}

ERROR at <SomeFunc>:  Error: call revert exception (method="someViewFunction(uint256)", errorArgs=[{"type":"BigNumber","hex":"0x32"}], errorName="Panic", errorSignature="Panic(uint256)", reason=null, code=CALL_EXCEPTION, version=abi/5.2.0)
    at Logger.makeError (<somePath>/node_modules/@ethersproject/logger/lib/index.js:187:21)
    at Logger.throwError (<somePath>/node_modules/@ethersproject/logger/lib/index.js:196:20)
    at Interface.decodeFunctionResult (<somePath>/node_modules/@ethersproject/abi/lib/interface.js:347:23)
    at Contract.<anonymous> (<somePath>/node_modules/@ethersproject/contracts/lib/index.js:329:56)
    at step (<somePath>/node_modules/@ethersproject/contracts/lib/index.js:48:23)
    at Object.next (<somePath>/node_modules/@ethersproject/contracts/lib/index.js:29:53)
    at fulfilled (<somePath>/node_modules/@ethersproject/contracts/lib/index.js:20:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  reason: null,
  code: 'CALL_EXCEPTION',
  method: 'someViewFunction(uint256)',
  errorArgs: [ BigNumber { _hex: '0x32', _isBigNumber: true } ],
  errorName: 'Panic',
  errorSignature: 'Panic(uint256)',
  address: '<someaddress>',
  args: [ BigNumber { _hex: '0x02e3', _isBigNumber: true } ],
  transaction: {
    data: '0xdabb053100000000000000000000000000000000000000000000000000000000000002e3',
    to: '<someaddress>'
  }
}

Thanks !

[ricmoo]

A Panic is returned from a Solidity contract. See Panic Error Codes for more details, but according to that document the cause is:

If you access an array, bytesN or an array slice at an out-of-bounds or negative index (i.e. x[i] where i >= x.length or i < 0).

(moving to discussions)

[defikintaro]

Thanks for the answer. It seems when I catch the contract event from ethersjs, the data is not yet created on blockchain. Is this possible ?
Actually on my smart contract first I'm creating the data (this is a slightly long operation) then I'm emitting event.

[zemse]

It seems when I catch the contract event from ethersjs, the data is not yet created on the blockchain. Is this possible ?

It is sometimes possible when using a remote node service like Infura for example. Infura has a load balancer, so it can be possible that though you got the event trigger from one node, and you immediately queried, your request was served from a node that was still syncing the block. You can simply try calling after a slight delay to see if this solves your problem.

[defikintaro]

Yea, while I don't like to put sleeps in my code, I've solved that way :)
My contract is on Avalanche network and I'm connecting directly to my contract. I don't know but this type of delay is interesting.
Anyways thanks !