From 2e1c70b56cee048e7cfa36b9e047d489bdea1584 Mon Sep 17 00:00:00 2001
From: Thomas Portelange <thomas@lekoala.be>
Date: Thu, 15 Mar 2018 20:40:05 +0100
Subject: [PATCH] Ensure tmpData exists

Otherwise you might get illegal string offset
---
 src/Forms/Form.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Forms/Form.php b/src/Forms/Form.php
index 9acef4df5..34b1b0792 100644
--- a/src/Forms/Form.php
+++ b/src/Forms/Form.php
@@ -1454,7 +1454,7 @@ class Form extends ViewableData implements HasRequestHandler
                         $tmpData = &$data[$name];
                         // drill down into the data array looking for the corresponding value
                         foreach ($keys as $arrayKey) {
-                            if ($arrayKey !== '') {
+                            if ($tmpData && $arrayKey !== '') {
                                 $tmpData = &$tmpData[$arrayKey];
                             } else {
                                 //empty square brackets means new array