I have a safe with 1 owner and 1 threshold. I am trying to do a simple token transfer transaction but getting an error.

// Able to create and sign transaction off-chain successfully

    "signatures": {}, // here signature is present
    "data": {
        "to": "0x213C77a6d109c300a3851DE1e42553Ad47f8187e",
        "value": "1000",
        "data": "0x", // Notice here data is not null
        "operation": 0,
        "baseGas": 0,
        "gasPrice": 0,
        "gasToken": "0x0000000000000000000000000000000000000000",
        "refundReceiver": "0x0000000000000000000000000000000000000000",
        "nonce": 3,
        "safeTxGas": 0

After this, proposing the transaction to the gnosis server successfully, now when I fetch the transaction again in order to execute it, the data field comes as null.

    "safe": "0x3C0574fb0FC4F6FFd765724DEC593017b636797a",
    "to": "0x213C77a6d109c300a3851DE1e42553Ad47f8187e",
    "value": "1000",
    "data": null, // Here data is null, I am not able to get it
    "operation": 0,
    "gasToken": "0x0000000000000000000000000000000000000000",
    "safeTxGas": 0,
    "baseGas": 0,
    "gasPrice": "0",
    "refundReceiver": "0x0000000000000000000000000000000000000000",
    "nonce": 0,
    "executionDate": null,
    "submissionDate": "2022-01-04T11:55:15.816271Z",
    "modified": "2022-01-04T11:55:15.837756Z",
    "blockNumber": null,
    "transactionHash": null,
    "safeTxHash": "0x38aaff98405aba4cd7ad988ea711c6db4f3a75a118f168f6b9e2cd44638e00ef",
    "executor": null,
    "isExecuted": false,
    "isSuccessful": null,
    "ethGasPrice": null,
    "gasUsed": null,
    "fee": null,
    "origin": null,
    "dataDecoded": null,
    "confirmationsRequired": null,
    "confirmations": [
            "owner": "0x213C77a6d109c300a3851DE1e42553Ad47f8187e",
            "submissionDate": "2022-01-04T11:55:15.837756Z",
            "transactionHash": null,
            "signature": "0x705868eb79f838f303553e95e79d7fe84c38a6433b4d432c66569f0c6db8066d608f4b816e70e7ff614056222db9ad7f1fe7fa0bb354c1db6c9db4b0376dc47c1f",
            "signatureType": "ETH_SIGN"
    "signatures": null

After converting this multisig transaction into the safe transaction, the below execute transaction function gives an error -

const executeTxResponse = await safeSdk.executeTransaction(safeTransaction)

TypeError: Cannot read properties of null (reading 'length')
    at ABICoder.formatParam (index.js?8fce:247)
    at eval (index.js?8fce:99)
    at Array.map (<anonymous>)
    at ABICoder.encodeParameters (index.js?8fce:93)
    at eval (index.js?7bbc:450)
    at Array.map (<anonymous>)
    at Object._encodeMethodABI (index.js?7bbc:449)
    at Object._processExecuteArguments (index.js?7bbc:713)
    at Object._executeMethod (index.js?7bbc:732)
    at GnosisSafeContract_V1_3_0_Web3.getTransactionHash (GnosisSafeContractWeb3.js?528e:34)
    at Safe.getTransactionHash (Safe.js?3512:232)
    at Safe.executeTransaction (Safe.js?3512:420)
    at _callee13$ (safe.js?273a:280)
    at tryCatch (runtime.js?2d8a:45)
    at Generator.invoke [as _invoke] (runtime.js?2d8a:274)
    at Generator.prototype.<computed> [as next] (runtime.js?2d8a:97)
    at asyncGeneratorStep (asyncToGenerator.js?d70f:3)
    at _next (asyncToGenerator.js?d70f:25)

I am simply following this guide and doing what is mentioned here. Would be grateful if someone could help me in resolving this.

1 Answer 1


This is a current shortcoming of the sdk/service combination (see https://github.com/gnosis/safe-core-sdk/issues/125). The best is to add a fallback when converting the tx: data: transaction.data || "0x"

  • 1
    Thanks, @Richard, it is working now by using the solution provided by you. I think until the issue gets resolved, docs should be updated as it takes so much time to do development and build the product due to such issues. Jan 5, 2022 at 9:58

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