Crash report: `TypeError: Cannot read properties of undefined (reading '0')`

URL

https://app.uniswap.org/#/add/0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48/ETH/3000?chain=mainnet

mintV3 state

{
  "independentField": "CURRENCY_A",
  "typedValue": "",
  "startPriceTypedValue": "",
  "leftRangeTypedValue": "",
  "rightRangeTypedValue": ""
}

Error

TypeError: Cannot read properties of undefined (reading '0')

Stacktrace

TypeError: Cannot read properties of undefined (reading '0')
    at https://app.uniswap.org/static/js/main.dfacf3cb.chunk.js:1:401821
    at Array.reduce (<anonymous>)
    at https://app.uniswap.org/static/js/main.dfacf3cb.chunk.js:1:401745
    at Object.Ta [as useMemo] (https://app.uniswap.org/static/js/3.ec50b941.chunk.js:2:1659109)
    at t.useMemo (https://app.uniswap.org/static/js/3.ec50b941.chunk.js:2:1578581)
    at https://app.uniswap.org/static/js/main.dfacf3cb.chunk.js:1:401382
    at Vg (https://app.uniswap.org/static/js/main.dfacf3cb.chunk.js:1:402703)
    at Kg (https://app.uniswap.org/static/js/main.dfacf3cb.chunk.js:1:405096)
    at ia (https://app.uniswap.org/static/js/3.ec50b941.chunk.js:2:1654376)
    at za (https://app.uniswap.org/static/js/3.ec50b941.chunk.js:2:1663943)

Device data

{
  "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.83 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "99.0.4844.83",
    "major": "99"
  },
  "engine": {
    "name": "Blink",
    "version": "99.0.4844.83"
  },
  "os": {
    "name": "Mac OS",
    "version": "10.15.7"
  },
  "device": {},
  "cpu": {}
}

The payload names no source file or test; begin by reproducing the crash at the supplied add-liquidity URL with the shown mintV3 state and tracing the minified stack back to its TypeScript source. Identify the undefined value behind the indexed access and verify that this flow no longer crashes with regression coverage.