diff --git a/loopback/locale/en.json b/loopback/locale/en.json
index 7372ac9a6..54d004400 100644
--- a/loopback/locale/en.json
+++ b/loopback/locale/en.json
@@ -247,5 +247,6 @@
 	"The raid information is not correct": "The raid information is not correct",
 	"Payment method is required": "Payment method is required",
     "Sales already moved": "Sales already moved",
-    "Holidays to past days not available": "Holidays to past days not available"
+    "Holidays to past days not available": "Holidays to past days not available",
+    "There are tickets to be invoiced": "There are tickets to be invoiced"
 }
diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index 8bb38fee0..e536e7e7d 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -390,6 +390,7 @@
 	"The web user's email already exists": "El correo del usuario web ya existe",
     "Sales already moved": "Ya han sido transferidas",
     "The raid information is not correct": "La información de la redada no es correcta",
-    "Holidays to past days not available": "Las vacaciones a días pasados no están disponibles"
+    "Holidays to past days not available": "Las vacaciones a días pasados no están disponibles",
+    "There are tickets to be invoiced": "La zona tiene tickets por facturar"
 }
 
diff --git a/modules/worker/back/methods/worker/createAbsence.js b/modules/worker/back/methods/worker/createAbsence.js
index e46ce9577..93ca7fd89 100644
--- a/modules/worker/back/methods/worker/createAbsence.js
+++ b/modules/worker/back/methods/worker/createAbsence.js
@@ -128,7 +128,10 @@ module.exports = Self => {
             const account = await models.VnUser.findById(userId, null, myOptions);
             const subordinated = await models.VnUser.findById(id, null, myOptions);
             const worker = await models.Worker.findById(subordinated.id, null, myOptions);
-            const departmentBoss = await models.VnUser.findById(worker.bossFk, null, myOptions);
+            const receiver = await models.EmailUser.findOne({
+                fields: ['email'],
+                where: {userFk: worker.bossFk}
+            }, myOptions);
             const url = await Self.app.models.Url.getUrl();
             const body = $t('Created absence', {
                 author: account.nickname,
@@ -140,7 +143,7 @@ module.exports = Self => {
             await models.Mail.create({
                 subject: $t('Absence change notification on the labour calendar'),
                 body: body,
-                receiver: departmentBoss.email
+                receiver: receiver.email
             }, myOptions);
 
             if (tx) await tx.commit();
diff --git a/modules/zone/back/methods/zone/deleteZone.js b/modules/zone/back/methods/zone/deleteZone.js
index e2e01a949..a147ee588 100644
--- a/modules/zone/back/methods/zone/deleteZone.js
+++ b/modules/zone/back/methods/zone/deleteZone.js
@@ -51,7 +51,7 @@ module.exports = Self => {
             };
 
             const ticketList = await models.Ticket.find(filter, myOptions);
-            const hasRefFk = ticketList.some(ticket => ticket.refFk);
+            const hasRefFk = ticketList.some(ticket => !ticket.refFk);
             if (hasRefFk)
                 throw new UserError('There are tickets to be invoiced');