Fixed empty form flash name after update

CHANGELOG.md

@@ -3,6 +3,7 @@
 
 1. [](#bugfix)
     * Fixed error in `ImageMedium::url()` if the image cache folder does not exist
+    * Fixed empty form flash name after update
 
 # v1.6.10
 ## 06/14/2019

system/src/Grav/Framework/Form/FormFlash.php

@@ -66,7 +66,7 @@ class FormFlash implements \JsonSerializable
             } catch (\Exception $e) {
                 $data = [];
             }
-            $this->formName = null !== $formName ? $content['form'] ?? '' : '';
+            $this->formName = $content['form'] ?? $formName;
             $this->url = $data['url'] ?? '';
             $this->user = $data['user'] ?? null;
             $this->data = $data['data'] ?? null;