Sending a transaction with Omni Wallet doesn't work

[calianlucian]

Is there an existing issue for this?

• I have searched the existing issues

Description

Sending a transaction using Omni Wallet doesnt' work.
The following error is displayed:
"invalid argument 0: json: cannot unmarshal non-string into Go value of type hexutil.Bytes"

Steps to reproduce

1. Go to: https://react-celo.vercel.app/
2. Connect using Omni Wallet. The connection is succesful.
3. Click "Test sendTransaction". The transaction is sent to Omni Wallet for approval. Transaction is approved from Omni wallet.
4. An error is displayed:
   "invalid argument 0: json: cannot unmarshal non-string into Go value of type hexutil.Bytes"

Expected behavior

The transaction should execute succesfully

Screenshot

Where is the problem happening?

Both

Environment

Device: Mac
OS: macOS
Browser: Brave
Version: v1.44.108

What version of react-celo were you using? (This can be found in the list of wallets in the "Connect" modal)

4.2.1

What wallet were you using?

No response

What is the dApp URL? (if applicable)

No response

Additional context

No response