diff --git a/src/PhpSpreadsheet/Worksheet/AutoFilter/Column.php b/src/PhpSpreadsheet/Worksheet/AutoFilter/Column.php
index 563cffdc..3e45a3da 100644
--- a/src/PhpSpreadsheet/Worksheet/AutoFilter/Column.php
+++ b/src/PhpSpreadsheet/Worksheet/AutoFilter/Column.php
@@ -376,21 +376,19 @@ class Column
     {
         $vars = get_object_vars($this);
         foreach ($vars as $key => $value) {
-            if (is_object($value)) {
-                if ($key == 'parent') {
-                    //    Detach from autofilter parent
-                    $this->$key = null;
-                } else {
-                    $this->$key = clone $value;
-                }
-            } elseif ((is_array($value)) && ($key == 'ruleset')) {
-                //    The columns array of \PhpOffice\PhpSpreadsheet\Worksheet\AutoFilter objects
-                $this->$key = [];
+            if ($key === 'parent') {
+                // Detach from autofilter parent
+                $this->parent = null;
+            } elseif ($key === 'ruleset') {
+                // The columns array of \PhpOffice\PhpSpreadsheet\Worksheet\AutoFilter objects
+                $this->ruleset = [];
                 foreach ($value as $k => $v) {
-                    $this->$key[$k] = clone $v;
-                    // attach the new cloned Rule to this new cloned Autofilter Cloned object
-                    $this->$key[$k]->setParent($this);
+                    $cloned = clone $v;
+                    $cloned->setParent($this); // attach the new cloned Rule to this new cloned Autofilter Cloned object
+                    $this->ruleset[$k] = $cloned;
                 }
+            } elseif (is_object($value)) {
+                $this->$key = clone $value;
             } else {
                 $this->$key = $value;
             }
diff --git a/tests/PhpSpreadsheetTests/Worksheet/AutoFilter/ColumnTest.php b/tests/PhpSpreadsheetTests/Worksheet/AutoFilter/ColumnTest.php
index 080f1bf8..ed9dfc9b 100644
--- a/tests/PhpSpreadsheetTests/Worksheet/AutoFilter/ColumnTest.php
+++ b/tests/PhpSpreadsheetTests/Worksheet/AutoFilter/ColumnTest.php
@@ -7,9 +7,7 @@ use PhpOffice\PhpSpreadsheet\Worksheet\AutoFilter;
 class ColumnTest extends \PHPUnit_Framework_TestCase
 {
     private $testInitialColumn = 'H';
-
     private $testAutoFilterColumnObject;
-
     private $mockAutoFilterObject;
 
     public function setUp()
@@ -111,9 +109,10 @@ class ColumnTest extends \PHPUnit_Framework_TestCase
 
     public function testSetAttributes()
     {
-        $attributeSet = ['val' => 100,
-                                'maxVal' => 200,
-                             ];
+        $attributeSet = [
+            'val' => 100,
+            'maxVal' => 200,
+        ];
 
         //    Setters return the instance to implement the fluent interface
         $result = $this->testAutoFilterColumnObject->setAttributes($attributeSet);
@@ -122,9 +121,10 @@ class ColumnTest extends \PHPUnit_Framework_TestCase
 
     public function testGetAttributes()
     {
-        $attributeSet = ['val' => 100,
-                                'maxVal' => 200,
-                             ];
+        $attributeSet = [
+            'val' => 100,
+            'maxVal' => 200,
+        ];
 
         $this->testAutoFilterColumnObject->setAttributes($attributeSet);
 
@@ -135,9 +135,10 @@ class ColumnTest extends \PHPUnit_Framework_TestCase
 
     public function testSetAttribute()
     {
-        $attributeSet = ['val' => 100,
-                                'maxVal' => 200,
-                             ];
+        $attributeSet = [
+            'val' => 100,
+            'maxVal' => 200,
+        ];
 
         foreach ($attributeSet as $attributeName => $attributeValue) {
             //    Setters return the instance to implement the fluent interface
@@ -148,9 +149,10 @@ class ColumnTest extends \PHPUnit_Framework_TestCase
 
     public function testGetAttribute()
     {
-        $attributeSet = ['val' => 100,
-                                'maxVal' => 200,
-                             ];
+        $attributeSet = [
+            'val' => 100,
+            'maxVal' => 200,
+        ];
 
         $this->testAutoFilterColumnObject->setAttributes($attributeSet);
 
@@ -164,7 +166,13 @@ class ColumnTest extends \PHPUnit_Framework_TestCase
 
     public function testClone()
     {
+        $originalRule = $this->testAutoFilterColumnObject->createRule();
         $result = clone $this->testAutoFilterColumnObject;
         $this->assertInstanceOf(AutoFilter\Column::class, $result);
+        $this->assertCount(1, $result->getRules());
+        $this->assertContainsOnlyInstancesOf(AutoFilter\Column\Rule::class, $result->getRules());
+        $clonedRule = $result->getRules()[0];
+        $this->assertNotSame($originalRule, $clonedRule);
+        $this->assertSame($result, $clonedRule->getParent());
     }
 }