From 0b02bbb11d4a7ab7d2a403f7435c8c05b9d989bc Mon Sep 17 00:00:00 2001
From: PiwEL <github@piwel.fr>
Date: Wed, 29 Jul 2020 16:54:40 +0200
Subject: [PATCH] JSON data has to be defined to test for errors

Robustness: json variable might be undefined.

Firefox 68-78+ (Windows, Mac) calls the success function with no parameters when page is unloading, triggering an uncaught error.
---
 js/core/core.ajax.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/core/core.ajax.js b/js/core/core.ajax.js
index d5272f4b3..a6884cedd 100644
--- a/js/core/core.ajax.js
+++ b/js/core/core.ajax.js
@@ -66,7 +66,7 @@ function _fnBuildAjax( oSettings, data, fn )
 	var baseAjax = {
 		"data": data,
 		"success": function (json) {
-			var error = json.error || json.sError;
+			var error = typeof json == 'undefined' || json.error || json.sError;
 			if ( error ) {
 				_fnLog( oSettings, 0, error );
 			}