The script will never generate a response.

I have written a worker that uses langchainjs.

ctx.waitUntil(requestModel.call(chat));
return new CorsResponse(readable).finalize(request);

ctx.waitUntil(requestModel.call(chat));
return new CorsResponse(readable).finalize(request);

ctx.waitUntil(requestModel.call(chat));
return new CorsResponse(readable).finalize(request);

ctx.waitUntil(requestModel.call(chat));
return new CorsResponse(readable).finalize(request);

The first execution per worker works, after that I am getting the error "The script will never generate a response"

Any ideas?