diff --git a/Collection.php b/Collection.php
index <HASH>..<HASH> 100755
--- a/Collection.php
+++ b/Collection.php
@@ -66,6 +66,8 @@ class Collection implements ArrayAccess, ArrayableInterface, Countable, Iterator
 

 		foreach ($this->items as $values)

 		{

+			if ($values instanceof Collection) $values = $values->all();

+

 			$results = array_merge($results, $values);

 		}
Add support for nested collections when using collapse