diff --git a/htdocs/core/lib/ajax.lib.php b/htdocs/core/lib/ajax.lib.php
index 102f8a0037f..2ddc7125d4a 100644
--- a/htdocs/core/lib/ajax.lib.php
+++ b/htdocs/core/lib/ajax.lib.php
@@ -430,7 +430,7 @@ function ajax_combobox($htmlname, $events=array(), $minLengthToAutocomplete=0, $
 	if ($forcefocus) $msg.= '.select2(\'focus\')';
 	$msg.= ';'."\n";
 
-	if (count($events))    // If an array of js events to do were provided.
+	if (is_array($events) && count($events))    // If an array of js events to do were provided.
 	{
 		$msg.= '
 			jQuery("#'.$htmlname.'").change(function () {