Cannot use 'in' operator to search for 'jquery' in undefined

[HolaMan]

I just use the sample code

var Crawler = require("crawler");
var url = require('url');

var c = new Crawler({
    maxConnections : 10,
    jQuery: 'cheerio',
    // This will be called for each crawled page
    callback : function (error, result, $) {
        // $ is Cheerio by default
        //a lean implementation of core jQuery designed specifically for the server
        $('a').each(function(index, a) {
            var toQueueUrl = $(a).attr('href');
            c.queue(toQueueUrl);
        });
    }
});

// Queue just one URL, with default callback
c.queue('https://news.ycombinator.com/');

and get the error while running

C:\Users\User\Desktop\crawler\node_modules\crawler\lib\crawler.js:34
if ('jquery' in options) {
^
TypeError: Cannot use 'in' operator to search for 'jquery' in undefined
at checkJQueryNaming (C:\Users\User\Desktop\crawler\node_modules\crawler\lib
\crawler.js:34:21)
at Crawler._pushToQueue (C:\Users\User\Desktop\crawler\node_modules\crawler
lib\crawler.js:210:15)
at Crawler.queue (C:\Users\User\Desktop\crawler\node_modules\crawler\lib\cra
wler.js:201:14)
at Object. (C:\Users\User\Desktop\crawler\app.js:13:15)
at exports.each (C:\Users\User\Desktop\crawler\node_modules\crawler\node_mod
ules\cheerio\lib\api\traversing.js:294:24)
at Object.Crawler.callback (C:\Users\User\Desktop\crawler\app.js:11:16)
at Crawler._onInject (C:\Users\User\Desktop\crawler\node_modules\crawler\lib
\crawler.js:473:13)
at C:\Users\User\Desktop\crawler\node_modules\crawler\lib\crawler.js:462:18
at Crawler._inject (C:\Users\User\Desktop\crawler\node_modules\crawler\lib\c
rawler.js:147:9)
at Crawler._onContent (C:\Users\User\Desktop\crawler\node_modules\crawler\li
b\crawler.js:461:14)

I am using Windows 8 with node version 0.10.32

[ghost]

Thanks, im having a look now. I was able to reproduce it, and will write a fix soon.

[ghost]

The problem is, at some point, you try to crawl an url with the value: undefined

c.queue(toQueueUrl);  //toQueueUrl is undefined

I'm writing a test, and a fix to skip this kind of obvious problem.

[ghost]

Fix in 0.4.1