Cannot generate videos - Fetch API fails with "String contains non ISO-8859-1 code point"

[Kane528]

## Description

I'm unable to generate any video with Open Generative AI.

Every model fails with the same JavaScript error before any request is sent to the API.

Environment

• OS: Windows 11
• Browser: Google Chrome (latest version)
• Open Generative AI: Web version
• API Provider: Muapi
• API Key: Configured successfully
• Logged in: Yes

Steps to Reproduce

1. Open Open Generative AI.
2. Configure a valid Muapi API key.
3. Select any video model (Hunyuan, Veo, Kling, etc.).
4. Click Generate.

Expected Behavior

The request should be sent and the video generation should start.

Actual Behavior

Nothing is generated.

The browser console shows:

Failed to execute 'fetch' on 'Window':
Failed to read the 'headers' property from 'RequestInit':
String contains non ISO-8859-1 code point.

also previously received:
Failed to execute 'setRequestHeader' on 'XMLHttpRequest':
String contains non ISO-8859-1 code point.

Additional Information
The problem occurs with every video model.
Local Storage is empty.
Browser extensions are disabled.
Chrome automatic translation is disabled.
I am fully logged into Muapi.
The API key is configured.
No network request is sent (nothing appears in the Network tab except static assets), suggesting the error happens before fetch() is executed.
Could this be caused by an invalid HTTP header containing Unicode characters?
Any help would be appreciated.

[Yusasif-AI]

is it not suppose to be open source ?

[Kane528]

is it not suppose to be open source ?

Yes, the application itself is open source. However, it uses MuAPI as the backend, and the API returned a 402 “Insufficient credit balance” error. My original issue was about a malformed HTTP header that prevented requests from being sent at all.