From f904c46a103d32057e220bab61e44c6a13d5c6e6 Mon Sep 17 00:00:00 2001
From: Philippe GRAND <philippe.grand@atoo-net.com>
Date: Mon, 30 Oct 2017 14:22:34 +0100
Subject: [PATCH] Warning: trim() expects parameter 1 to be string, array given
 in /httpdocs/core/lib/functions.lib.php on line 520

---
 htdocs/core/lib/functions.lib.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 85ea597644d..a376661829c 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -517,6 +517,8 @@ function GETPOST($paramname, $check='alpha', $method=0, $filter=NULL, $options=N
 			if (preg_match('/[^0-9,]+/i',$out)) $out='';
 			break;
 		case 'alpha':
+			if (!is_string($out))
+			return $out;
 			$out=trim($out);
 			// '"' is dangerous because param in url can close the href= or src= and add javascript functions.
 			// '../' is dangerous because it allows dir transversals