From f1e5c72e43375e6137b984c90a96f7cf331591ff Mon Sep 17 00:00:00 2001
From: Christopher Darling <me@christopherdarling.co.uk>
Date: Wed, 31 Mar 2021 14:55:50 +0100
Subject: [PATCH] BUG fieldNameError() references invalid $this->form

FieldList references `$this->form` which doesn't exist from what I can see. I presume this should have been `$field->getForm()`.

However, please note that I came across this when looking for something unrelated and haven't tested this PR.
---
 src/Forms/FieldList.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Forms/FieldList.php b/src/Forms/FieldList.php
index 5ec25798a..695c6ca5c 100644
--- a/src/Forms/FieldList.php
+++ b/src/Forms/FieldList.php
@@ -155,11 +155,11 @@ class FieldList extends ArrayList
      */
     protected function fieldNameError(FormField $field, $functionName)
     {
-        if ($this->form) {
+        if ($field->getForm()) {
             $errorSuffix = sprintf(
                 " in your '%s' form called '%s'",
-                get_class($this->form),
-                $this->form->getName()
+                get_class($field->getForm()),
+                $field->getForm()->getName()
             );
         } else {
             $errorSuffix = '';