From 1f0c9736819b8bb879641bb6cbaaf5ddc826c7e4 Mon Sep 17 00:00:00 2001
From: Wouter <WrDX@users.noreply.github.com>
Date: Fri, 9 Mar 2018 16:51:08 +0100
Subject: [PATCH] Don't break on removing a non-existing rule

---
 lib/Cake/Model/ModelValidator.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Cake/Model/ModelValidator.php b/lib/Cake/Model/ModelValidator.php
index f968e2cff..c84e58f75 100644
--- a/lib/Cake/Model/ModelValidator.php
+++ b/lib/Cake/Model/ModelValidator.php
@@ -594,7 +594,7 @@ class ModelValidator implements ArrayAccess, IteratorAggregate, Countable {
 		$this->_parseRules();
 		if ($rule === null) {
 			unset($this->_fields[$field]);
-		} else {
+		} elseif (array_key_exists($field, $this->_fields)) {
 			$this->_fields[$field]->removeRule($rule);
 		}
 		return $this;