Cannot set headers after they are sent to the client

[manduda]

Although the login works, it throws me this console error:

I'm using Nest Express configuration.

(Sorry if I'm not clear. It's my first issue post)

(node:13865) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at new NodeError (internal/errors.js:322:7)
at ServerResponse.setHeader (_http_outgoing.js:561:11)
at ServerResponse.header (/xxxxxxx/node_modules/express/lib/response.js:771:10)
at ServerResponse.send (/xxxxxxx/node_modules/express/lib/response.js:170:12)
at ServerResponse.json (/xxxxxxx/node_modules/express/lib/response.js:267:15)
at ExpressAdapter.reply (/xxxxxxx/node_modules/@nestjs/platform-express/adapters/express-adapter.js:24:57)
at ExceptionsHandler.handleUnknownError (/xxxxxxx/node_modules/@nestjs/core/exceptions/base-exception-filter.js:33:24)
at ExceptionsHandler.catch (/xxxxxxx/node_modules/@nestjs/core/exceptions/base-exception-filter.js:17:25)
at ExceptionsHandler.next (/xxxxxxx/node_modules/@nestjs/core/exceptions/exceptions-handler.js:16:20)
at /xxxxxxx/node_modules/@nestjs/core/router/router-proxy.js:13:35
(Use node --trace-warnings ... to show where the warning was created)
(node:13865) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:13865) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.