diff --git a/src/CrawlerDetect.php b/src/CrawlerDetect.php
index 3ea284a..48961d1 100644
--- a/src/CrawlerDetect.php
+++ b/src/CrawlerDetect.php
@@ -169,6 +169,7 @@ public function isCrawler($userAgent = null)
         ));
 
         if ($agent === '') {
+            $this->matches = array();
             return false;
         }
 
diff --git a/tests/UserAgentTest.php b/tests/UserAgentTest.php
index dd6f265..21bf029 100644
--- a/tests/UserAgentTest.php
+++ b/tests/UserAgentTest.php
@@ -129,6 +129,16 @@ public function matches_does_not_persit_across_multiple_calls()
         $this->CrawlerDetect->isCrawler('This should not match');
         $matches = $this->CrawlerDetect->getMatches();
         $this->assertNull($this->CrawlerDetect->getMatches());
+        
+        //Empty
+        $this->CrawlerDetect->isCrawler('Mozilla/5.0 (iPhone; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit (KHTML, like Gecko) Mobile (compatible; Yahoo Ad monitoring; https://help.yahoo.com/kb/yahoo-ad-monitoring-SLN24857.html)');
+        $this->CrawlerDetect->isCrawler('');
+        $this->assertNull($this->CrawlerDetect->getMatches());
+
+        //Excluded
+        $this->CrawlerDetect->isCrawler('Mozilla/5.0 (iPhone; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit (KHTML, like Gecko) Mobile (compatible; Yahoo Ad monitoring; https://help.yahoo.com/kb/yahoo-ad-monitoring-SLN24857.html)');
+        $this->CrawlerDetect->isCrawler('iPod');
+        $this->assertNull($this->CrawlerDetect->getMatches());
     }
 
     /** @test */