From c3b0401ee59e46e86674802ffe2b9aa867059233 Mon Sep 17 00:00:00 2001
From: Jake Bentvelzen <jakeb@blissmedia.com.au>
Date: Wed, 14 Oct 2015 14:00:24 +1100
Subject: [PATCH] Fixed a bug where an error occurred when attempting to change
 the page type of 'Blog'

---
 code/model/Blog.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/code/model/Blog.php b/code/model/Blog.php
index 9a8cabe..ba4bd7b 100644
--- a/code/model/Blog.php
+++ b/code/model/Blog.php
@@ -546,10 +546,13 @@ class Blog extends Page implements PermissionProvider {
 
 		$group = $this->getUserGroup();
 
-		foreach(array($this->Editors(), $this->Writers(), $this->Contributors()) as $levels) {
-			foreach($levels as $user) {
-				if(!$user->inGroup($group)) {
-					$user->Groups()->add($group);
+		// Must check if the method exists or else an error occurs when changing page type
+		if ($this->hasMethod('Editors')) {
+			foreach(array($this->Editors(), $this->Writers(), $this->Contributors()) as $levels) {
+				foreach($levels as $user) {
+					if(!$user->inGroup($group)) {
+						$user->Groups()->add($group);
+					}
 				}
 			}
 		}