Uniswap / Uniswap/interface

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

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Dominant language
TypeScript
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Description

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.1d448b81.chunk.js:1:438482
    at Array.reduce (<anonymous>)
    at https://app.uniswap.org/static/js/main.1d448b81.chunk.js:1:438406
    at Object.Aa [as useMemo] (https://app.uniswap.org/static/js/35.4cd51aae.chunk.js:2:1353145)
    at t.useMemo (https://app.uniswap.org/static/js/35.4cd51aae.chunk.js:2:1288165)
    at https://app.uniswap.org/static/js/main.1d448b81.chunk.js:1:438043
    at uv (https://app.uniswap.org/static/js/main.1d448b81.chunk.js:1:439372)
    at Wv (https://app.uniswap.org/static/js/main.1d448b81.chunk.js:1:445282)
    at ua (https://app.uniswap.org/static/js/35.4cd51aae.chunk.js:2:1348412)
    at Va (https://app.uniswap.org/static/js/35.4cd51aae.chunk.js:2:1357979)

Device data

{
  "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "99.0.4844.84",
    "major": "99"
  },
  "engine": {
    "name": "Blink",
    "version": "99.0.4844.84"
  },
  "os": {
    "name": "Mac OS",
    "version": "10.15.3"
  },
  "device": {},
  "cpu": {}
}

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the crash at the supplied add-liquidity URL using the reported mintV3 state, then trace the minified stack through the Array.reduce and useMemo calls. Done means the same URL and state no longer produce the TypeError.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
frontend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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