From 4c5b1983c1c288cc6ca1dc431fbd2183930d4d84 Mon Sep 17 00:00:00 2001
From: Kamil Kuzminski <kamil.kuzminski@codefog.pl>
Date: Fri, 20 May 2022 13:32:32 +0200
Subject: [PATCH] Fix PHP 8 compatibility

---
 MPForms.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MPForms.php b/MPForms.php
index ce12c84..c57958b 100644
--- a/MPForms.php
+++ b/MPForms.php
@@ -50,7 +50,7 @@ public function compileFormFields($formFields, $formId, Form $form)
         // but still save data already added to the input fields so it is
         // there when they come back to the current step
         if ('back' === ($_POST['mp_form_pageswitch'] ?? null)) {
-            $manager->storeData($_POST, [], (array) $_SESSION['FILES']);
+            $manager->storeData($_POST, [], (array) ($_SESSION['FILES'] ?? []));
             $this->redirectToStep($manager, $manager->getPreviousStep());
         }