diff --git a/src/Ballybran/Core/Collections/Collection/IteratorDot.php b/src/Ballybran/Core/Collections/Collection/IteratorDot.php
index <HASH>..<HASH> 100644
--- a/src/Ballybran/Core/Collections/Collection/IteratorDot.php
+++ b/src/Ballybran/Core/Collections/Collection/IteratorDot.php
@@ -264,7 +264,7 @@ class IteratorDot implements ArrayAccess, Countable, IteratorAggregate
             $items = (array)$this->get($key);
             $value = array_merge($items, $this->getArrayItems($value));
             $this->set($key, $value);
-        } elseif ($key instanceof self) {
+        } elseif ($key) {
             $this->elements = array_merge($this->elements, $key->all());
         }
     }
Update IteratorDot.php