diff -r 1a0218d4faac -r 7d7ccf92d6af src/pyams_skin/resources/js/myams-require.js
--- a/src/pyams_skin/resources/js/myams-require.js	Fri Nov 08 10:52:48 2019 +0100
+++ b/src/pyams_skin/resources/js/myams-require.js	Thu Feb 13 11:22:10 2020 +0100
@@ -7,7 +7,7 @@
  *
  * Custom administration and application skin tools
  * Released under Zope Public License ZPL 1.1
- * ©2014-2016 Thierry Florac <tflorac@ulthar.net>
+ * ©2014-2020 Thierry Florac <tflorac@ulthar.net>
  */
 
 "use strict";
@@ -227,6 +227,7 @@
 			enableMobile: false,
 			enableFastclick: false,
 			warnOnFormChange: false,
+			formChangedCallback: null,
 			ismobile: (/iphone|ipad|ipod|android|blackberry|mini|windows\sce|palm/i.test(navigator.userAgent.toLowerCase()))
 		};
 	}