diff --git a/composer.json b/composer.json
index acb8b4c..38b9ae1 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.6.4",
-        "illuminate/database": "5.3.*|5.4.*"
+        "illuminate/database": "5.3.*|5.4.*|5.5.*"
     },
     "require-dev": {
         "crysalead/kahlan": "~1.1"
diff --git a/src/Hookable.php b/src/Hookable.php
index 0fff197..94483cd 100644
--- a/src/Hookable.php
+++ b/src/Hookable.php
@@ -144,7 +144,7 @@ public function save(array $options = [])
      */
     public function isDirty($attributes = null)
     {
-        if (! is_array($attributes) && !is_null($attributes)) {
+        if (! is_array($attributes)) {
             $attributes = func_get_args();
         }