hello, i have a problem, i created a saas application from the api of a backend application in node js, the problem is that when i run it on multiple users

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hello, i have a problem, i created a saas application from the api of a backend application in node js, the problem is that when i run it on multiple users, it gives me the message of next error

instead of res.sen...
Error [ERR_HTTP_HEADERS_SENT]: Unable to set headers after sending to client
to the new NodeError (node:internal/errors:405:5)
on ServerResponse.setHeader (node:_http_outgoing:648:11)

I did some research and it seems that it will be necessary to add return res.sen.. on its own