Here is a contract I deployed on my private network:

pragma solidity ^0.4.13;

contract test {
    string stat;
    address owner;

    event statChanged(string _stat);

    function test() {
        stat = "INIT";
        owner = msg.sender;

    function() payable {
        stat = "PAID";

    function getStat() constant returns (string) {
        return stat;

    function getBalance() constant returns (uint) {
        return this.balance;

    function getOwner() constant returns (address) {
        return owner;

    function send2Owner() {

    function update(string _stat) {
        stat = _stat;

I send ETH to the contract:

eth.sendTransaction({from: owner, to: contract, value: 1100000, gas: 200000, gasPrice: 1})

By running the contract .getBalance() I can see that the correct amount of ETH has arrived at the contract address, .getOwner() I can also see a good owner address too. Finally, I run .send2Owner to send the ETH back to owner:

var testContract = web3.eth.contract(...).at("...");

Now I get this error:

Error: invalid address
    at web3.js:3879:15
    at web3.js:3705:20
    at web3.js:4948:28
    at map (<native code>)
    at web3.js:4947:12
    at web3.js:4973:18
    at web3.js:4998:23
    at web3.js:4061:16
    at apply (<native code>)
    at web3.js:4147:16

Why am I getting this error?

  • where you define the web3 var? – Gawey Jul 28 '17 at 6:46
  • To answer your question, I run the script in geth console by loadScript("send2Owner.js"). In the script contains something like the following before getting the error --> var testContract = web3.eth.contract(...).at("..."); var output = testContract.send2Owner(); console.log(output); – Consy Jul 28 '17 at 7:04
  • First check if the abi and the contract adress are the real adress before this web3.eth.contract(...).at("...");, i don't know how work in geth but for example if you use metamask you need a web3 injected item for the good conection with the account, so you problem is when you try to send cause this is diferent action , you can check balance and getOwner because this don't do any change in the blockchain. – Gawey Jul 28 '17 at 7:18

Missed a parameter when I launch .send2Owner()

var testContract = web3.eth.contract(...).at("...");

This is the correct version

var testContract = web3.eth.contract(...).at("...");

Try to set the default account and then execute:

web3.eth.defaultAccount = web3.eth.accounts[0]

Hope this helps...!

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