// Load modules

var Crypto = require('crypto');

// Declare internals

var internals = {};


exports = module.exports = function (options) {

    return {
        protocol: 'oauth2',
        auth: 'https://www.linkedin.com/uas/oauth2/authorization',
        token: 'https://www.linkedin.com/uas/oauth2/accessToken',
        scope: ['r_fullprofile', 'r_emailaddress', 'r_contactinfo'],
        scopeSeparator: ',',
        profile: function (credentials, params, get, callback) {

            var query = {
                format: 'json',
                appsecret_proof: Crypto.createHmac('sha256', this.clientSecret).update(credentials.token).digest('hex')
            };

            var fields = '';
            if (this.providerParams.fields) {
                fields = this.providerParams.fields;
            }

            get('https://api.linkedin.com/v1/people/~' + fields, query, function (profile) {

                credentials.profile = {
                    id: profile.id,
                    name: {
                        first: profile.firstName,
                        last: profile.lastName
                    },
                    email: profile.email,
                    headline: profile.headline,
                    raw: profile
                };
                return callback();
            });
        }
    };
};

@@ -728,24 +728,47 @@
 oviderParams
+ && this.providerParams
 .fields) %7B%0A 

Check if `this.providerParams` is defined