× Unhandled Rejection (TypeError): Cannot read property 'toString' of null

[Madssimo]

`
const networkId = await web3.eth.net.getId()

const tokenData = Token.networks[networkId]
if(tokenData) {
  const token = new web3.eth.Contract(Token.abi, tokenData.address)
  this.setState({ token })
  let tokenBalance = await token.methods.balanceOf(this.state.account).call()
  this.setState({ tokenBalance: tokenBalance.toString() })
} else {
  window.alert('Token contract not deployed to detected network.')
}`

[upanshu1310]

Yes I am having the same problem. Someone please help

[Barrendero]

Bros, just try this
Balance: {this.props.ethBalance ? window.web3.utils.fromWei(this.props.ethBalance.toString(), 'Ether') : ''}

[Simba0427]

@Madssimo, please try to migrate again.
truffle migrate --reset
That helped me.

[codingDr]

@Madssimo, please try to migrate again. truffle migrate --reset That helped me.

This is what I had to do as well. The reason this happened (for me) was that I was using the Quick Start Ganache chain instead of creating a workspace. After a PC reboot, the quick start chain was wiped. I recommend making a persistent workspace in Ganache, which will require reimporting the account into Metamask as well. Then migrate your contracts to the persistent chain as Simba0427 stated and you should be good to go.

[JoshuaDB]

@Simba0427

@Madssimo, please try to migrate again.
truffle migrate --reset
That helped me.

Thanks, that helped me as well.

[ameetmund]

@Madssimo, please try to migrate again. truffle migrate --reset That helped me.

Thanks @Simba0427 ... this helped me.

[wjlai1234]

same it's work!