Uniswap / Uniswap/interface

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

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Dominant language
TypeScript
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Description

URL

https://app.uniswap.org/#/swap

swap state

{
  "INPUT": {
    "currencyId": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
  },
  "OUTPUT": {
    "currencyId": null
  },
  "independentField": "INPUT",
  "typedValue": "",
  "recipient": null
}

Error

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

Stacktrace

TypeError: Cannot read properties of undefined (reading 'current')
    at https://app.uniswap.org/static/js/main.fd2499c6.chunk.js:1:994349
    at Object.Qa [as useMemo] (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3693758)
    at t.useMemo (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3518814)
    at O (https://app.uniswap.org/static/js/main.fd2499c6.chunk.js:1:994197)
    at fe (https://app.uniswap.org/static/js/main.fd2499c6.chunk.js:1:836406)
    at Sa (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3689347)
    at Pf (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3701035)
    at Ss (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3747442)
    at gu (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3735495)
    at mu (https://app.uniswap.org/static/js/7.30a4123e.chunk.js:2:3735423)

Device data

{
  "ua": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "106.0.0.0",
    "major": "106"
  },
  "engine": {
    "name": "Blink",
    "version": "106.0.0.0"
  },
  "os": {
    "name": "Windows",
    "version": "10"
  },
  "device": {},
  "cpu": {
    "architecture": "amd64"
  }
}

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

Start by reproducing the crash at https://app.uniswap.org/#/swap with the reported swap state, then use the main.fd2499c6.chunk.js stack entry and the useMemo call as the initial trace. Done means the swap page loads without the undefined-current TypeError for this state.

Written by the indexing model from the issue text.

Assessment

Tech stack
react, typescript
Domain
blockchain, frontend, web-dev
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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