TypeError: Cannot set property 'accessToken' of undefined

[strongant]

passport.use(new QQStrategy({
clientID: config.qq.clientID,
clientSecret: config.qq.clientSecret,
callbackURL: config.qq.callbackURL,
passReqToCallback: true
},
function(accessToken, refreshToken, profile, done) {
console.log('refreshToken:');
console.log(refreshToken);
console.log('accessToken:');
console.log(accessToken);
console.log('profile:');
console.log(profile);
var providerData = profile._json;
providerData.accessToken = accessToken;
providerData.refreshToken = refreshToken;
var providerUserProfile = {
firstName: profile.name.givenName,
lastName: profile.name.familyName,
fullName: profile.displayName,
email: profile.emails[0].value,
username: profile.username,
provider: 'qq',
profiderId: profile.id,
providerData: providerData
};
users.saveOAuthUserProfile(req, providerUserProfile, done);
}
));