ERR_HTTP_HEADERS_SENT - Firebase / Node js / Express

[Tomy Tubert]

Hi!

I'm developing my backend with Express and Firebase.

I'm having problems with this error:

_http_outgoing.js:558
    throw new ERR_HTTP_HEADERS_SENT('set');
    ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:558:11)
    at ServerResponse.header (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/express/lib/response.js:794:10)
    at ServerResponse.send (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/express/lib/response.js:174:12)
    at ServerResponse.json (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/express/lib/response.js:278:15)
    at /Users/tomytubertgonzalez/Desktop/OMD/omd_api/controllers/advert.controllers.js:26:25
    at DocumentWatch.onNext (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/@google-cloud/firestore/build/src/reference.js:429:21)
    at DocumentWatch.pushSnapshot (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/@google-cloud/firestore/build/src/watch.js:468:18)
    at DocumentWatch.onData (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/@google-cloud/firestore/build/src/watch.js:352:26)
    at PassThrough.<anonymous> (/Users/tomytubertgonzalez/Desktop/OMD/omd_api/node_modules/@google-cloud/firestore/build/src/watch.js:314:26)
    at PassThrough.emit (events.js:315:20) {
  code: 'ERR_HTTP_HEADERS_SENT'
}

The function is:

exports.updateAdvert = async (req, res) => {

try{

const {id,advert} = req.body;

await db.collection("adverts").doc(id).update(advert);

return res.status(200).json({advert});

}catch(e){

return res.status(400).json({ message: `Llamada fallida: ${e}` });

}

};

It's weird because the .update() is executed but the backend brakes because that error.

Actually I try it without try catch but nothing changes.

Thanks!