diff --git a/app/Traits/HasFiles.php b/app/Traits/HasFiles.php
index 5146afd..06a5745 100644
--- a/app/Traits/HasFiles.php
+++ b/app/Traits/HasFiles.php
@@ -20,6 +20,10 @@ trait HasFiles
 
     public function updateFiles($files, $collection = null): void
     {
+        if($files === null) {
+            $files = '';
+        }
+
         if (is_string($files)) {
             $files = Helpers::stringToArray($files);
         }