diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index 75cc4e3..f0b5295 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -212,10 +212,10 @@ class Curl
      */
     public function close()
     {
-        if ($this->curl !== null) {
+        if (is_resource($this->curl) || $this->curl instanceof \CurlHandle) {
             curl_close($this->curl);
-            $this->curl = null;
         }
+        $this->curl = null;
         $this->options = null;
         $this->jsonDecoder = null;
         $this->jsonDecoderArgs = null;
@@ -1459,7 +1459,7 @@ class Curl
      */
     public function reset()
     {
-        if (function_exists('curl_reset') && $this->curl !== null) {
+        if (function_exists('curl_reset') && (is_resource($this->curl) || $this->curl instanceof \CurlHandle)) {
             curl_reset($this->curl);
         } else {
             $this->curl = curl_init();
diff --git a/src/Curl/MultiCurl.php b/src/Curl/MultiCurl.php
index d1dcf75..7d760fe 100644
--- a/src/Curl/MultiCurl.php
+++ b/src/Curl/MultiCurl.php
@@ -393,10 +393,10 @@ class MultiCurl
             $curl->close();
         }
 
-        if ($this->multiCurl !== null) {
+        if (is_resource($this->multiCurl) || $this->multiCurl instanceof \CurlMultiHandle) {
             curl_multi_close($this->multiCurl);
-            $this->multiCurl = null;
         }
+        $this->multiCurl = null;
     }
 
     /**
diff --git a/tests/PHPCurlClass/PHPCurlClassTest.php b/tests/PHPCurlClass/PHPCurlClassTest.php
index 4fc1ddf..3daed6d 100644
--- a/tests/PHPCurlClass/PHPCurlClassTest.php
+++ b/tests/PHPCurlClass/PHPCurlClassTest.php
@@ -3023,11 +3023,9 @@ class CurlTest extends \PHPUnit\Framework\TestCase
 
     public function testClose()
     {
-        $test = new Test();
-        $curl = $test->curl;
-        $curl->setHeader('X-DEBUG-TEST', 'post');
+        $curl = new Curl();
         $curl->post(Test::TEST_URL);
-        $this->assertNotNull($curl->curl);
+        $this->assertTrue(is_object($curl->curl) || is_resource($curl->curl));
         $curl->close();
         $this->assertNull($curl->curl);
     }
diff --git a/tests/PHPCurlClass/PHPMultiCurlClassTest.php b/tests/PHPCurlClass/PHPMultiCurlClassTest.php
index ae79ca6..bc42c77 100644
--- a/tests/PHPCurlClass/PHPMultiCurlClassTest.php
+++ b/tests/PHPCurlClass/PHPMultiCurlClassTest.php
@@ -2977,7 +2977,7 @@ class MultiCurlTest extends \PHPUnit\Framework\TestCase
         $multi_curl = new MultiCurl();
         $multi_curl->addGet(Test::TEST_URL);
         $multi_curl->start();
-        $this->assertNotNull($multi_curl->multiCurl);
+        $this->assertTrue(is_object($multi_curl->multiCurl) || is_resource($multi_curl->multiCurl));
         $multi_curl->close();
         $this->assertNull($multi_curl->multiCurl);
     }