Invalid state: ReadableStream is locked

[madanstc]

Hello, whenever we deploy to production, we are getting the following error:

Error [AI_APICallError]: Failed to process successful response
0|client | at processTicksAndRejections (null) {
0|client | url: 'https://api.openai.com/v1/responses',
0|client | requestBodyValues: [Object],
0|client | statusCode: 200,
0|client | responseHeaders: [Object],
0|client | responseBody: undefined,
0|client | isRetryable: false,
0|client | data: undefined,
0|client | [cause]: Error [TypeError]: Invalid state: ReadableStream is locked
0|client | at (null)
0|client | at processTicksAndRejections (null) {
0|client | code: 'ERR_INVALID_STATE',
0|client | toString: [Function: toString]
0|client | }
0|client | }
0|client | {"type":"stream_debug","stage":"ui_stream_on_error","chatId":"7ea858df-355e-4a13-9e62-c9fa01ae0c04","userId":"26dfc698-ae63-4270-a592-74fc7c61ab54","error":"Failed to process successful response","errorStack":"Error: Failed to process successful response\n at (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3709:68)\n at (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3319:55)\n at (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3773:15)\n at runUpdateMessageJob (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3772:46)\n at transform (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3319:19)\n at transform (/home/ubuntu/apps/ai-chatbot/apps/client/.next/dev/server/chunks/node_modules_ai_dist_index_mjs_b0116780..js:3318:33)\n at (native)\n at (native)\n at (native)\n at (native)\n at (native)\n at (native)\n at (native)\n at (native)\n at processTicksAndRejections (native)","timestamp":"2025-11-27T10:49:00.187Z"}

the setup is nginx as reverse proxy, and chatbot app running.

nginx config is

server {
listen 443 ssl;
server_name _;

ssl_certificate     /etc/nginx/ssl/ssl_certificate.crt;
ssl_certificate_key /etc/nginx/ssl/ssl_certificate_key.key;

# Proxy main app (Next.js)
location / {
    proxy_pass http://host.docker.internal:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;

    # Important for streaming
    proxy_buffering off;
    proxy_cache_bypass $http_upgrade;
    chunked_transfer_encoding on;
}

# Route /mcp* to API with prefix stripping
location ~ ^/mcp/(.*)$ {
    proxy_pass http://host.docker.internal:3001/$1;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_buffering off;
    proxy_request_buffering off;
}

# Health endpoint
location = /health {
    return 200 "OK\n";
}

}