diff --git a/src/Base/Concern/HasAttributes.php b/src/Base/Concern/HasAttributes.php
index 6cafdc4a9..840831ba1 100644
--- a/src/Base/Concern/HasAttributes.php
+++ b/src/Base/Concern/HasAttributes.php
@@ -335,13 +335,13 @@ protected function addCastAttributesToArray(array $attributes, array $mutatedAtt
             }
 
             if ($flags & Arrayable::SKIP_NULL) {
-                if (null === $attributes[$key]) {
-                    unset($attributes[$key]);
-                }
-
                 if (is_array($attributes[$key])) {
                     $attributes[$key] = Utils::filterNull($attributes[$key]);
                 }
+
+                if (null === $attributes[$key]) {
+                    unset($attributes[$key]);
+                }
             }
 
             if ($flags & Arrayable::CASE_SNAKE || $flags & Arrayable::CASE_KEBAB || $flags & Arrayable::CASE_STUDLY) {