diff --git a/src/Collection/CollectionTrait.php b/src/Collection/CollectionTrait.php
index a3493de9cb3..e286f6dfc29 100644
--- a/src/Collection/CollectionTrait.php
+++ b/src/Collection/CollectionTrait.php
@@ -696,7 +696,7 @@ public function cartesianProduct(callable $operation = null, callable $filter =
         $collectionArraysKeys = [];
         $collectionArraysCounts = [];
 
-        foreach ($this as $value) {
+        foreach ($this->toList() as $value) {
             if (count($value) !== count($value, COUNT_RECURSIVE)) {
                 throw new LogicException('Cannot find the cartesian product of a multidimensional array');
             }