diff --git a/rhodecode/public/js/src/rhodecode/comments.js b/rhodecode/public/js/src/rhodecode/comments.js
--- a/rhodecode/public/js/src/rhodecode/comments.js
+++ b/rhodecode/public/js/src/rhodecode/comments.js
@@ -729,7 +729,7 @@ var CommentsController = function() {
 
                         if (xhr !== undefined){
                             var httpStatus = xhr.status + " " + xhr.statusText;
-                            if (xhr.status >= 500) {
+                            if (xhr !== undefined && xhr.status >= 500) {
                                 error = httpStatus;
                             }
                         }
diff --git a/rhodecode/templates/files/files_upload.mako b/rhodecode/templates/files/files_upload.mako
--- a/rhodecode/templates/files/files_upload.mako
+++ b/rhodecode/templates/files/files_upload.mako
@@ -170,7 +170,7 @@
 
                     if (xhr !== undefined){
                         var httpStatus = xhr.status + " " + xhr.statusText;
-                        if (xhr.status >= 500) {
+                        if (xhr !== undefined && xhr.status >= 500) {
                             error = httpStatus;
                         }
                     }