diff --git a/src/DataTransferObject.php b/src/DataTransferObject.php
index 960d997..522ec6b 100644
--- a/src/DataTransferObject.php
+++ b/src/DataTransferObject.php
@@ -74,7 +74,11 @@ protected function setItems(array $items): void
 
     protected function getValueByKey(array $items, string $key, string $default)
     {
-        return Arr::get($items, $key) ?: Arr::get($items, $default);
+        if (Arr::exists($items, $key)) {
+            return Arr::get($items, $key);
+        }
+
+        return Arr::get($items, $default);
     }
 
     /**
diff --git a/tests/Unit/MapTest.php b/tests/Unit/MapTest.php
index 8f23e2a..0602aef 100644
--- a/tests/Unit/MapTest.php
+++ b/tests/Unit/MapTest.php
@@ -58,4 +58,23 @@ public function testToArray()
             'baz' => $this->baz,
         ], $object->toArray());
     }
+
+    public function testMissingValues()
+    {
+        $object = new Map([
+            'wa' => [
+                'sd' => $this->foo,
+            ],
+
+            'qwe.rty' => false,
+        ]);
+
+        $this->assertIsArray($object->toArray());
+
+        $this->assertSame([
+            'foo' => $this->foo,
+            'bar' => false,
+            'baz' => null,
+        ], $object->toArray());
+    }
 }