From 5f31f36a175a4e722db12c7af9c150adf737e8fe Mon Sep 17 00:00:00 2001
From: Damian Mooyman <damian@silverstripe.com>
Date: Mon, 20 Jun 2016 09:54:33 +1200
Subject: [PATCH] BUG Prevent strstr showing warning on array $value Fixes #481

---
 code/formfields/UserFormsCheckboxSetField.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/formfields/UserFormsCheckboxSetField.php b/code/formfields/UserFormsCheckboxSetField.php
index f8f7d14..1fd5954 100644
--- a/code/formfields/UserFormsCheckboxSetField.php
+++ b/code/formfields/UserFormsCheckboxSetField.php
@@ -46,7 +46,7 @@ class UserFormsCheckboxSetField extends CheckboxSetField {
 
 		$previous = $value = $this->Value();
 
-		if (strstr($value, ",")) {
+		if (is_string($value) && strstr($value, ",")) {
 			$value = explode(",", $value);
 		}