diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index c0761fa4..d07565fb 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -238,15 +238,15 @@ $(document).ready(function() {
         api_with_auth({
             url: Urls['kfet.kpsul.perform_operations'](),
             data: data,
-            on_success: function(data) {
+            on_success: function() {
                 updatePreviousOp();
                 coolReset();
             },
-            on_400: function(data) {
-                if ('need_comment' in data['errors'])
+            on_400: function(response) {
+                if ('need_comment' in response['errors'])
                     askComment(performOperations);
                 else
-                    displayErrors(getErrorsHtml(data));
+                    displayErrors(getErrorsHtml(response));
             },
             next_focus: articleSelect,
         });
@@ -269,11 +269,11 @@ $(document).ready(function() {
         api_with_auth({
             url: Urls['kfet.kpsul.cancel_operations'](),
             data: data,
-            on_success: function(data) {
+            on_success: function() {
                 coolReset();
             },
-            on_400: function(data) {
-                displayErrors(getErrorsHtml(data));
+            on_400: function(response) {
+                displayErrors(getErrorsHtml(response));
             },
             next_focus: kpsul.account_manager,
         });
@@ -815,8 +815,8 @@ $(document).ready(function() {
             api_with_auth({
                 url: Urls['kfet.kpsul.update_addcost'](),
                 data: data,
-                on_400: function(data) {
-                    askAddcost(getErrorsHtml(data));
+                on_400: function(response) {
+                    askAddcost(getErrorsHtml(response));
                 },
                 next_focus: kpsul.account_manager,
             });