diff --git a/tests/Support/SupportOptionalTest.php b/tests/Support/SupportOptionalTest.php
index 343cc457a1f6..9f5560ab5d08 100644
--- a/tests/Support/SupportOptionalTest.php
+++ b/tests/Support/SupportOptionalTest.php
@@ -79,6 +79,7 @@ public function testIssetExistItemOnArray()
         $optional = new Optional($targetArr);
 
         $this->assertTrue(isset($optional['item']));
+        $this->assertTrue(isset($optional->item));
     }
 
     public function testIssetNotExistItemOnArray()
@@ -88,5 +89,15 @@ public function testIssetNotExistItemOnArray()
         $optional = new Optional($targetArr);
 
         $this->assertFalse(isset($optional['item']));
+        $this->assertFalse(isset($optional->item));
+    }
+
+    public function testIssetExistItemOnNull()
+    {
+        $targetNull = null;
+
+        $optional = new Optional($targetNull);
+
+        $this->assertFalse(isset($optional->item));
     }
 }