From 4907f9581fe8dddc45d99d03e7cea279318ebd85 Mon Sep 17 00:00:00 2001
From: Laurent Destailleur <eldy@destailleur.fr>
Date: Tue, 3 Jan 2017 11:34:37 +0100
Subject: [PATCH] Fix warning

---
 htdocs/accountancy/class/html.formventilation.class.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/htdocs/accountancy/class/html.formventilation.class.php b/htdocs/accountancy/class/html.formventilation.class.php
index 376e5b00d56..e1a21d852ea 100644
--- a/htdocs/accountancy/class/html.formventilation.class.php
+++ b/htdocs/accountancy/class/html.formventilation.class.php
@@ -83,6 +83,8 @@ class FormVentilation extends Form
 
 		require_once DOL_DOCUMENT_ROOT . '/core/lib/accounting.lib.php';
 
+		$out = '';
+		
     	$options = array();
 		if ($usecache && ! empty($this->options_cache[$usecache]))
 		{
@@ -109,7 +111,7 @@ class FormVentilation extends Form
     			return -1;
     		}
 
-    		$out = ajax_combobox($htmlname, $event);
+    		$out .= ajax_combobox($htmlname, $event);
 
     		$selected = 0;
     		while ($obj = $this->db->fetch_object($resql))
-- 
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