Error: Can't set headers after they are sent.

[GPlay97]

View details in Rollbar: https://rollbar.com/gplay97/EVNotifyBackend/items/181/

Error: Can't set headers after they are sent.
  File "_http_outgoing.js", line 491, in validateHeader
  File "_http_outgoing.js", line 498, in ServerResponse.setHeader
  File "/home/gplay97/EVNotifyBackend/node_modules/express/lib/response.js", line 775, in ServerResponse.header
        this.setHeader(field, value);
  File "/home/gplay97/EVNotifyBackend/node_modules/express/lib/response.js", line 174, in ServerResponse.send
          this.set('Content-Type', setCharset(type, 'utf-8'));
  File "/home/gplay97/EVNotifyBackend/node_modules/express/lib/response.js", line 271, in ServerResponse.json
      return this.send(body);
  File "/home/gplay97/EVNotifyBackend/modules/integrations/abrp/index.js", line 30, in token.validateToken
                res.json(err || 'unauthorized');
  File "/home/gplay97/EVNotifyBackend/modules/token/index.js", line 20, in db.query
            callback(err, (!err && dbRes && dbRes[0] && dbRes[0].token === token));
  File "/home/gplay97/EVNotifyBackend/modules/db/index.js", line 30, in Query.db.query
                    if (typeof callback === 'function') callback(err, queryRes);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/Connection.js", line 525, in Query.<anonymous>
          fn.apply(this, arguments);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/Connection.js", line 491, in Query._callback
          ret = fn.apply(this, arguments);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/sequences/Sequence.js", line 83, in Query.Sequence.end
            this._callback.apply(this, arguments);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/sequences/Query.js", line 139, in Query._handleFinalResultPacket
      this.end(this._loadError, results, fields);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/sequences/Query.js", line 123, in Query.EofPacket
      this._handleFinalResultPacket(packet);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/Protocol.js", line 291, in Protocol._parsePacket
      sequence[packetName](packet);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/Parser.js", line 433, in Parser._parsePacket
        this._onPacket(packetHeader);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/Parser.js", line 43, in Parser.write
        this._parsePacket(packetHeader);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/protocol/Protocol.js", line 38, in Protocol.write
      this._parser.write(buffer);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/Connection.js", line 91, in Socket.<anonymous>
          connection._protocol.write(data);
  File "/home/gplay97/EVNotifyBackend/node_modules/mysql/lib/Connection.js", line 525, in Socket.<anonymous>
          fn.apply(this, arguments);
  File "events.js", line 116, in emitOne
  File "events.js", line 211, in Socket.emit
  File "_stream_readable.js", line 263, in addChunk