diff --git a/src/Form/Field/MultipleFile.php b/src/Form/Field/MultipleFile.php
index 0b25df8acc..283181dcbb 100644
--- a/src/Form/Field/MultipleFile.php
+++ b/src/Form/Field/MultipleFile.php
@@ -91,8 +91,8 @@ public function getValidator(array $input)
         }
 
         $attributes[$this->column] = $this->label;
-
-        list($rules, $input) = $this->hydrateFiles(Arr::get($input, $this->column) ?? []);
+        $fileNames = Arr::get($input, $this->column);
+        list($rules, $input) = $this->hydrateFiles($fileNames ? (is_array($fileNames) ? $fileNames : $fileNames->toArray()) : []);
 
         return \validator($input, $rules, $this->getValidationMessages(), $attributes);
     }