diff --git a/src/CrawlCommand.php b/src/CrawlCommand.php
index 8a64de1..b7879d8 100644
--- a/src/CrawlCommand.php
+++ b/src/CrawlCommand.php
@@ -37,9 +37,9 @@ class CrawlCommand extends Command
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $baseUrl = $input->getArgument('url');
-        $crawler=new Crawler($baseUrl);
+        $crawler=new Crawler();
         $crawler->crawl($baseUrl);
-        
+
         foreach($crawler->getResults() as $url=>$result){
                 $output->writeln("{$result['code']} {$url}");
                 if($input->getOption('found-on')){
diff --git a/src/Crawler.php b/src/Crawler.php
index e6b3218..6ca04b7 100644
--- a/src/Crawler.php
+++ b/src/Crawler.php
@@ -16,7 +16,7 @@ class Crawler{
     private $observer;
     private $crawler;
 
-    public function __construct($baseUrl){
+    public function __construct($baseUrl=null){
         $this->observer = new CrawlObserver();
         $this->crawler = SpatieCrawler::create([
             RequestOptions::ALLOW_REDIRECTS => [
@@ -26,9 +26,11 @@ class Crawler{
             RequestOptions::TIMEOUT => 10,
         ])
             //->setMaximumDepth(1)
-            ->setCrawlProfile(new CrawlInternalUrls($baseUrl))
             ->setCrawlObserver($this->observer)
         ;
+        if($baseUrl){
+            $this->crawler->setCrawlProfile(new CrawlInternalUrls($baseUrl));
+        }
     }
 
     public function crawl($url){