diff --git a/modules/ticket/back/methods/sale/priceDifference.js b/modules/ticket/back/methods/sale/priceDifference.js
index c744a8321..65c3dd80f 100644
--- a/modules/ticket/back/methods/sale/priceDifference.js
+++ b/modules/ticket/back/methods/sale/priceDifference.js
@@ -1,6 +1,8 @@
+const UserError = require('vn-loopback/util/user-error');
+
 module.exports = Self => {
     Self.remoteMethod('priceDifference', {
-        description: 'Returns sales with price difference',
+        description: 'Returns sales with price difference if the ticket is editable',
         accessType: 'READ',
         accepts: [{
             arg: 'ticketFk',
@@ -26,6 +28,10 @@ module.exports = Self => {
     });
 
     Self.priceDifference = async(ticketFk, data) => {
+        let thisTicketIsEditable = await Self.app.models.Ticket.isEditable(ticketFk);
+        if (!thisTicketIsEditable)
+            throw new UserError(`The sales of this ticket can't be modified`);
+
         let filter = {
             where: {
                 ticketFk: ticketFk
diff --git a/modules/ticket/front/data/step-one/index.js b/modules/ticket/front/data/step-one/index.js
index 54aac4c2f..125c10a75 100644
--- a/modules/ticket/front/data/step-one/index.js
+++ b/modules/ticket/front/data/step-one/index.js
@@ -118,7 +118,7 @@ class Controller {
         });
     }
 
-    async onStepChange(state) {
+    async onStepChange() {
         if (this.isFormInvalid()) {
             return this.vnApp.showError(
                 this.$translate.instant('Some fields are invalid')
@@ -138,11 +138,15 @@ class Controller {
                 this.ticket.sale = res.data;
 
             return true;
-        }, res => {
-            if (res.data.error.message === 'NO_AGENCY_AVAILABLE') {
+        }, err => {
+            if (err.data.error.message === 'NO_AGENCY_AVAILABLE') {
                 this.vnApp.showMessage(
                     this.$translate.instant(`There's no available agency for this landing date`)
                 );
+            } else {
+                this.vnApp.showMessage(
+                    this.$translate.instant(err.data.error.message)
+                );
             }
         });
     }