[WEBJS] - /api/sendImage fails with "Data passed to getter must include an id property ... but got undefined"

[DidiDerDenker]

Describe the bug

Sending an image via POST /api/sendImage fails with a 500 error.

The failure happens inside the WEBJS engine while evaluating window.WWebJS.sendMessage against WhatsApp Web. WhatsApp Web throws:

Data passed to getter must include an id property (it's how we memoize) but got undefined

Version

{
  "version": "2026.7.1",
  "engine": "WEBJS",
  "tier": "PLUS",
  "browser": "Chrome",
  "platform": "linux/x64"
}

Steps

To Reproduce Steps to reproduce the behavior:

1. Run WAHA with engine WEBJS.
2. Start and authenticate a session (QR pairing), state WORKING.
3. Send a POST /api/sendImage request to a channel chat (…@newsletter):

{
  "session": "***",
  "chatId": "***@newsletter",
  "file": {
    "mimetype": "image/jpeg",
    "filename": "filename.jpg",
    "url": "https://***"
  },
  "caption": "string"
}

4. Observe the 500 response / log error below.

Error Response / Log

[15:15:21.698] INFO (48): request errored {"reqId":260,"req":{"id":260,"method":"POST","url":"/api/sendImage","query":{},"params":{"path":["api","sendImage"]}},"res":{"statusCode":500},"responseTime":1495}
    err: {
      "type": "Error",
      "message": "Data passed to getter must include an id property (it's how we memoize) but got undefined\ns (https://static.whatsapp.net/rsrc.php/v4/y8/r/utfPCwANvyO.js:85:180)",
      "stack":
          Error: Data passed to getter must include an id property (it's how we memoize) but got undefined
          s (https://static.whatsapp.net/rsrc.php/v4/y8/r/utfPCwANvyO.js:85:180)
              at window.WWebJS.sendMessage (evaluate at WPage.evaluate (/app/dist/core/engines/webjs/WPage.js:13:36), <anonymous>:506:24)
              at #evaluate (/app/node_modules/puppeteer-core/lib/cjs/puppeteer/cdp/ExecutionContext.js:391:56)
              at async ExecutionContext.evaluate (/app/node_modules/puppeteer-core/lib/cjs/puppeteer/cdp/ExecutionContext.js:277:16)
              at async IsolatedWorld.evaluate (/app/node_modules/puppeteer-core/lib/cjs/puppeteer/cdp/IsolatedWorld.js:100:16)
              at async CdpFrame.evaluate (/app/node_modules/puppeteer-core/lib/cjs/puppeteer/api/Frame.js:362:20)
              at async CdpPage.evaluate (/app/node_modules/puppeteer-core/lib/cjs/puppeteer/api/Page.js:818:20)
              at async WPage.evaluate (/app/dist/core/engines/webjs/WPage.js:13:20)
              at async WebjsClientCore.sendMessage (/app/node_modules/whatsapp-web.js/src/Client.js:1625:25)
              at async descriptor.value (/app/dist/core/abc/activity.js:9:20)
      "name": "Error"
    }

Expected behavior

The image should be sent successfully to the target chat/channel, as documented for WEBJS (POST /api/sendImage).

Troubleshooting already done

• Session was in a healthy/WORKING state before the request.
• Payload follows the documented sendImage format (session, chatId, file.mimetype, file.url, file.filename, optional caption).
• Error originates in WhatsApp Web JS (static.whatsapp.net/...) during WWebJS.sendMessage, not during request validation / media download.
• sendText works (!)

Additional context

• Target appears to be a WhatsApp Channel (chatId ending with @newsletter).
• This looks related to WhatsApp Web internal store/LID changes breaking WEBJS media send (similar class of regressions as #2149 / channel media discussions).

[DidiDerDenker]

@devlikepro Hi, can you estimate how long it will take to solve the problem? We've been using WAHA for quite a long time and have some problems with ours customers right now. Looking forward to a good solution as always, thanks :)

[DominikVogelDEV]

Topic is urgent for me as well

[devlikepro]

You need to update WAHA; the issue has been fixed in the latest version.