diff --git a/src/MsGraphAdmin.php b/src/MsGraphAdmin.php
index 2e94ad5..2fd8b23 100644
--- a/src/MsGraphAdmin.php
+++ b/src/MsGraphAdmin.php
@@ -162,9 +162,9 @@ public function __call(string $function, array $args): mixed
         }
     }
 
-    protected function isJson(object|string $data): bool
+    protected function isJson(string $data): bool
     {
-        return is_string($data) && is_array(json_decode($data, true)) && (json_last_error() == JSON_ERROR_NONE);
+        return is_array(json_decode($data, true)) && (json_last_error() == JSON_ERROR_NONE);
     }
 
     /**
diff --git a/src/Resources/Files.php b/src/Resources/Files.php
index 89f36f9..9347876 100644
--- a/src/Resources/Files.php
+++ b/src/Resources/Files.php
@@ -10,8 +10,8 @@ class Files extends MsGraph
     public function getFiles(string $path = '', string $type = 'me'): array
     {
         $path = blank($path)
-            ? $type . '/drive/root/children?$orderby=name%20asc'
-            : $type . '/drive/root:' . $this->forceStartingSlash($path) . ':/children';
+            ? $type.'/drive/root/children?$orderby=name%20asc'
+            : $type.'/drive/root:'.$this->forceStartingSlash($path).':/children';
 
         if (is_array($msGraph = MsGraph::get($path))) {
             return $msGraph;