discussions tx.wait() return error: not an array

[RoeiBenZeev]

const buyAction = async (tokenToBuyWith, tokenToPurchase) => { console.log("In buy action") try { const amountIn = data.BNBAmount; const amount = await router.getAmountOut(amountIn, tokenToBuyWith, tokenToPurchase, { 'gasLimit': data.gasLimit, 'gasPrice': data.gasPrice }); const amountOutMin = (amount.mul(100 - ${data.Slippage}).div(100));

    console.log(
        clc.green.inverse(`Start to buy \n`)
        +
        `Buying Token
    =================
    tokenIn: ${(amountIn * 1e-18).toString()} ${tokenToBuyWith} (BNB)
    tokenOut: ${amountOutMin.toString()} ${tokenToPurchase}
  `);

    const tx = await router.swapExactTokensForTokens(
        amountIn,
        amountOutMin,
        [tokenToBuyWith, tokenToPurchase],
        data.recipient,
        Math.floor(Date.now() / 1000) + 60 * 10, //10 minutes
        {
            'gasLimit': data.gasLimit,
            'gasPrice': data.gasPrice,
            "value": BigNumber.from(0)
        });

    const receipt = await tx.wait();
    console.log(`Transaction receipt : https://www.bscscan.com/tx/${receipt.logs[1].transactionHash}`);
    console.log(receipt);
} catch (err) {
    let error = JSON.parse(JSON.stringify(err));
    console.log(`Error caused by :
    {
    reason : ${error.reason},
    transactionHash : ${error.transactionHash}
    message : ${error}
    }`);
    console.log(error);
}

}

this is the code im running to swap BNB to WBNB on bsc.

my code fail on tx.wait() and throwing and Error: not an array

im hard to find what is wrong with the code / the parameters im sending.

[ricmoo]

I don't quite understand. The tx.wait() returns a TransactionReceipt, and if the transaction failed (mined, but with a status of 0) throws an error.

It should never return an Array. What would you expect the Array to be of?

[mastilver]

not an array is the error being thrown by ethers.js

I'm getting the same error (also on BSC), here's the full stack

Error: not an array
    at Object.logs (/usr/src/app/node_modules/@ethersproject/providers/lib/formatter.js:408:23)
    at Function.Formatter.check (/usr/src/app/node_modules/@ethersproject/providers/lib/formatter.js:373:40)
    at Formatter.receipt (/usr/src/app/node_modules/@ethersproject/providers/lib/formatter.js:325:32)
    at JsonRpcProvider.<anonymous> (/usr/src/app/node_modules/@ethersproject/providers/lib/base-provider.js:1707:70)
    at step (/usr/src/app/node_modules/@ethersproject/providers/lib/base-provider.js:48:23)
    at Object.next (/usr/src/app/node_modules/@ethersproject/providers/lib/base-provider.js:29:53)
    at fulfilled (/usr/src/app/node_modules/@ethersproject/providers/lib/base-provider.js:20:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

[mastilver]

what is happening is that the RPC node returns an empty body (null) if the transaction receipt is not available

We are not using wait() so our temporary fix / hack will be different (you can always replace wait by calling getTransactionReceipt until you get an answer)

export async function getTransactionReceipt(hash: string): Promise<TransactionReceipt | null> {
  try {
    return await bscProvider()
          .getTransactionReceipt(hash)
  } catch (err) {
    // When the transaction is not present, the RPC returns an empty body
    if (err.code === 'SERVER_ERROR' && err.body === null) {
      return null
    }

    throw err
  }
}

[ricmoo]

Closing older issues. But if this is still happening in v6, please re-open or start a new issue.

Thanks! :)