Errors on ChatGPT command - string manipulation

I can use most of the other functionality that I have tested, but when I run a simple query in the `:ChatGPT` command
I get such errors. I do receive results, but I have to press multiple times `Enter` to continue.
I have `copilot` enabled and use a proxy to access chatGPT backend.

Thanks for your efforts

```
Error executing vim.schedule lua callback: .../site/pack/packer/start/ChatGPT.nvim/lua/chatgpt/api.lua:67: attempt to concatenate fie
ld 'content' (a userdata value)
stack traceback:
.../site/pack/packer/start/ChatGPT.nvim/lua/chatgpt/api.lua:67: in function 'on_stdout_chunk'
.../site/pack/packer/start/ChatGPT.nvim/lua/chatgpt/api.lua:332: in function <.../site/pack/packer/start/ChatGPT.nvim/lua/cha
tgpt/api.lua:321>
Press ENTER or type command to continue
Error executing vim.schedule lua callback: vim/shared.lua:0: s: expected string, got userdata
stack traceback:
[C]: in function 'error'
vim/shared.lua: in function 'validate'
vim/shared.lua: in function 'gsplit'
vim/shared.lua: in function 'split'
...acker/start/ChatGPT.nvim/lua/chatgpt/flows/chat/base.lua:270: in function 'addAnswerPartial'
...acker/start/ChatGPT.nvim/lua/chatgpt/flows/chat/base.lua:784: in function ''
vim/_editor.lua: in function
```

Start with lua/chatgpt/api.lua at line 67 and then inspect lua/chatgpt/flows/chat/base.lua around line 270. Reproduce a :ChatGPT query with the reported proxy setup, checking how streamed output is handled. Done means the query completes without userdata or scheduled-callback errors and no repeated Enter presses are required.

Written by the indexing model from the issue text.