diff -r 848894fde5fc -r c390a4b8ca80 src/ztfy/myams/resources/js/myams.js
--- a/src/ztfy/myams/resources/js/myams.js	Fri Jun 29 15:12:51 2018 +0200
+++ b/src/ztfy/myams/resources/js/myams.js	Tue Jan 14 13:11:39 2020 +0100
@@ -833,7 +833,7 @@
 				ams.ajax.handleJSON(response.data);
 			} else {
 				var title = error || event.statusText || event.type;
-				var message = response.responseText;
+				var message = response.responseText || response.data;
 				ams.skin.messageBox('error', {
 					title: ams.i18n.ERROR_OCCURED,
 					content: '<h4>' + title + '</h4><p>' + (message || '') + '</p>',