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openclaw - 💡(How to fix) Fix [Bug]: [Bug]: Web version WebChat shows "Maximum call stack size exceeded" when uploading attachments larger than ~4MB [2 comments, 2 participants]

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openclaw/openclaw#81606•Fetched 2026-05-14 03:30:31
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Author
Alexzzz2008Alexzzz2008
Participants
Alexzzz2008Alexzzz2008clawsweeper[bot]clawsweeper[bot]
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commented ×2labeled ×2cross-referenced ×1renamed ×1

Error Message

When I upload an attachment larger than around 3MB, the upload fails and the web UI shows the following error:

Code Example

Maximum call stack size exceeded

### Steps to reproduce

Open OpenClaw WebChat / Control UI in a browser.
Start a new chat.
Upload an attachment larger than around 4MB.
Send the message.
The upload fails and the web UI shows:

### Expected behavior

The web version should upload the attachment successfully, or at least show a clear file size / file type limit message.

For example:

The uploaded file exceeds the supported size limit.

### Actual behavior

The upload fails with:

Maximum call stack size exceeded

### OpenClaw version

2026.5.7

### Operating system

debian12

### Install method

_No response_

### Model

gpt-5.5

### Provider / routing chain

openclaw

### Additional provider/model setup details

_No response_

### Logs, screenshots, and evidence
RAW_BUFFERClick to expand / collapse

Bug type

Behavior bug (incorrect output/state without crash)

Beta release blocker

No

Summary

Bug Description

I am using the web version of OpenClaw, specifically the WebChat / Control UI.

When I upload an attachment larger than around 3MB, the upload fails and the web UI shows the following error:

Maximum call stack size exceeded

### Steps to reproduce

Open OpenClaw WebChat / Control UI in a browser.
Start a new chat.
Upload an attachment larger than around 4MB.
Send the message.
The upload fails and the web UI shows:

### Expected behavior

The web version should upload the attachment successfully, or at least show a clear file size / file type limit message.

For example:

The uploaded file exceeds the supported size limit.

### Actual behavior

The upload fails with:

Maximum call stack size exceeded

### OpenClaw version

2026.5.7

### Operating system

debian12

### Install method

_No response_

### Model

gpt-5.5

### Provider / routing chain

openclaw

### Additional provider/model setup details

_No response_

### Logs, screenshots, and evidence

```shell

Impact and severity

No response

Additional information

No response

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FAQ

Expected behavior

The web version should upload the attachment successfully, or at least show a clear file size / file type limit message.

For example:

The uploaded file exceeds the supported size limit.

#memory optimization#batch processing#GPU compatibility#latency issue#model loading

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openclaw - 💡(How to fix) Fix [Bug]: [Bug]: Web version WebChat shows "Maximum call stack size exceeded" when uploading attachments larger than ~4MB [2 comments, 2 participants]