diff --git a/composer.json b/composer.json
index 8f7b336..e35165c 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "jhodges/sitemap",
-    "description": "generate full sitemap report",
+    "description": "Generate full sitemap report using spatie/crawler",
     "type": "project",
     "require": {
         "php": "^7.1",
@@ -26,6 +26,9 @@
         "patches": {
             "spatie/crawler": {
                 "add crawled again observer": "https://patch-diff.githubusercontent.com/raw/spatie/crawler/pull/280.patch"
+            },
+            "guzzlehttp/guzzle": {
+                "Status code must be an integer value between 1xx and 5xx": "https://patch-diff.githubusercontent.com/raw/guzzle/guzzle/pull/2591.patch"
             }
         }
     }
diff --git a/tests/CrawlerTest.php b/tests/CrawlerTest.php
index 3b11706..d3b7d78 100644
--- a/tests/CrawlerTest.php
+++ b/tests/CrawlerTest.php
@@ -20,6 +20,7 @@ class CrawlerTest extends TestCase{
             'http://localhost:8080/interlinked2' => ['code' => 200],
             'http://localhost:8080/interlinked3' => ['code' => 200],
             'http://localhost:8080/internalServerError' => ['code' => 500],
+            'http://localhost:8080/invalidStatusCode' => ['code' => '---'],
             'http://localhost:8080/notFound' => ['code' => 404],
             'http://localhost:8080/redirect1' => ['code' => 302],
             'http://localhost:8080/redirect2' => ['code' => 302],
@@ -165,6 +166,15 @@ class CrawlerTest extends TestCase{
         ], print_r($sitemap,true));
     }
 
+    public function testInvalidStatusCode(){
+        $crawler=new Crawler();
+        $crawler->crawl('http://localhost:8080/invalidStatusCode');
+        $sitemap=$crawler->getResults();
+        $this->assertTreeContains($sitemap,[
+            'http://localhost:8080/invalidStatusCode' => ['code' => '---'],
+        ], print_r($sitemap,true));
+    }
+
     public function assertTreeContains($haystack, $contains, $crumbs=''){
         foreach($contains as $k=>$v){
             $this->assertArrayHasKey($k, $haystack, $crumbs);
diff --git a/tests/server/server.js b/tests/server/server.js
index f90e79c..d8155d5 100644
--- a/tests/server/server.js
+++ b/tests/server/server.js
@@ -16,6 +16,7 @@ app.get('/', function (request, response) {
         '    <li><a href="/redirectLoop">redirectLoop</a></li>',
         '    <li><a href="/timeout">timeout</a></li>',
         '    <li><a href="/internalServerError">internalServerError</a></li>',
+        '    <li><a href="/invalidStatusCode">invalidStatusCode</a></li>',
         '    <li><a href="/twoRedirectsToSameLocation">twoRedirectsToSameLocation</a></li>',
         '    <li><a href="mailto:test@example.com">mailto</a></li>',
         '    <li><a href="tel:+4412345678">tel</a></li>',
@@ -78,6 +79,10 @@ app.get('/internalServerError', function (request, response) {
     response.status(500).end();
 });
 
+app.get('/invalidStatusCode', function (request, response) {
+    response.status(999).end();
+});
+
 app.get('/interlinked1', function (request, response) {
     response.end('<a href="/interlinked1">1</a><a href="/interlinked2">2</a><a href="/interlinked3">3</a>');
 });