Uniswap / Uniswap/interface

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

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Dominant language
TypeScript
Stars
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Description

URL

https://app.diffusion.fi/#/swap

swap state

{
  "INPUT": {
    "currencyId": "EVMOS"
  },
  "OUTPUT": {
    "currencyId": ""
  },
  "independentField": "INPUT",
  "typedValue": "777",
  "recipient": null
}

Error

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

Stacktrace

TypeError: Cannot read properties of undefined (reading 'tokens')
    at im (https://app.diffusion.fi/static/js/main.fe3de569.chunk.js:1:282600)
    at https://app.diffusion.fi/static/js/main.fe3de569.chunk.js:1:283198
    at Array.sort (<anonymous>)
    at https://app.diffusion.fi/static/js/main.fe3de569.chunk.js:1:285162
    at Object.useMemo (https://app.diffusion.fi/static/js/4.fe475264.chunk.js:2:1124316)
    at t.useMemo (https://app.diffusion.fi/static/js/4.fe475264.chunk.js:2:1042538)
    at dm (https://app.diffusion.fi/static/js/main.fe3de569.chunk.js:1:285140)
    at no (https://app.diffusion.fi/static/js/4.fe475264.chunk.js:2:1118351)
    at Xs (https://app.diffusion.fi/static/js/4.fe475264.chunk.js:2:1170809)
    at Tu (https://app.diffusion.fi/static/js/4.fe475264.chunk.js:2:1157983)

Device data

{
  "ua": "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "100.0.4896.127",
    "major": "100"
  },
  "engine": {
    "name": "Blink",
    "version": "100.0.4896.127"
  },
  "os": {
    "name": "Windows",
    "version": "8.1"
  },
  "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.diffusion.fi/#/swap with the reported swap state and inspect the stacktrace from the generated main.fe3de569.chunk.js bundle. Trace the minified functions around the Array.sort and tokens access, then verify that the swap page no longer crashes for this state.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
blockchain, 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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