Infinite Cart Fetch / tokenDetails.decimals not found

**Describe the bug**

Infinite "Fetching Cart Data" screen.
Console:
`TypeError: Cannot read property 'decimals' of undefined`

**To Reproduce**
Add a grant to my cart, attempt to checkout

**Expected behavior**

**Screenshots**

**Desktop (please complete the following information):**

- OS: Windows
- Browser: Chrome
- Browser Version: 89.0.4389.82

**Additional context**

Looks like its something with tokenDetails being undefined when calculating amount.

```
// Generate array of objects containing donation info from cart
let gitcoinFactor = String(100 - (100 * this.gitcoinFactor));
const donations = this.grantsByTenant.map((grant, index) => {
const tokenDetails = this.getTokenByName(grant.grant_donation_currency);
const amount = parseUnits(String(grant.grant_donation_amount || 0), tokenDetails.decimals)
.mul(gitcoinFactor)
.div(100);
```