diff --git a/modules/route/back/methods/route/cmrEmail.js b/modules/route/back/methods/route/cmrEmail.js
index d05d721006..0c4cc50613 100644
--- a/modules/route/back/methods/route/cmrEmail.js
+++ b/modules/route/back/methods/route/cmrEmail.js
@@ -57,7 +57,7 @@ module.exports = Self => {
                             AND dt.code = 'cmr'
                     `, [ticketId]);
 
-                if (!dms.lenght) throw new UserError('Cmr file does not exist');
+                if (!dms.length) throw new UserError('Cmr file does not exist');
 
                 const response = await models.Dms.downloadFile(ctx, dms[0].id);
 
diff --git a/modules/ticket/back/methods/ticket/saveSign.js b/modules/ticket/back/methods/ticket/saveSign.js
index 14968c203c..aa970237f3 100644
--- a/modules/ticket/back/methods/ticket/saveSign.js
+++ b/modules/ticket/back/methods/ticket/saveSign.js
@@ -34,6 +34,8 @@ module.exports = Self => {
         const myOptions = {userId: ctx.req.accessToken.userId};
         let tx;
         let ticket;
+        let dms;
+        let isSignUploaded;
         let externalTickets = [];
 
         if (typeof options == 'object')
@@ -59,19 +61,15 @@ module.exports = Self => {
         }
 
         async function hasSignDms(ticketId) {
-            const ticketDms = await models.TicketDms.findOne({
-                where: {ticketFk: ticketId},
-                include: [
-                    {
-                        relation: 'dms',
-                        fields: ['id'],
-                        scope: {
-                            where: {dmsTypeFk: dmsTypeTicket.id}
-                        }
-                    }
-                ]
-            });
-            if (ticketDms?.dms()?.id) return true;
+            const hasTicketDms = await Self.rawSql(`
+                SELECT d.id
+                    FROM ticketDms td
+                        JOIN dms d ON d.id = td.dmsFk
+                    WHERE td.ticketFk = ?
+                        AND d.dmsTypeFk = ?
+            `, [ticketId, dmsTypeTicket.id], myOptions);
+
+            if (hasTicketDms.length) return true;
         }
 
         async function createGestDoc() {
@@ -84,8 +82,10 @@ module.exports = Self => {
                 description: `Firma del cliente - Ruta ${ticket.route().id}`,
                 hasFile: true
             };
-            const dms = await models.Dms.uploadFile(ctxUploadFile, myOptions);
-            await models.TicketDms.create({ticketFk: ticket.id, dmsFk: dms[0].id}, myOptions);
+            dms = await models.Dms.uploadFile(ctxUploadFile, myOptions);
+            // Si se ha subido ya la firma, no se vuelve a subir, ya que si no
+            // da un error de deadlock en la db
+            isSignUploaded = true;
         }
 
         try {
@@ -112,17 +112,17 @@ module.exports = Self => {
                             fields: ['id']
                         }
                     }]
-                });
+                }, myOptions);
 
                 const ticketState = await models.TicketState.findOne({
                     where: {ticketFk: ticketId},
                     fields: ['alertLevel']
-                });
+                }, myOptions);
 
                 const packedAlertLevel = await models.AlertLevel.findOne({
                     where: {code: 'PACKED'},
                     fields: ['id']
-                });
+                }, myOptions);
 
                 if (!ticketState)
                     throw new UserError('Ticket does not exist');
@@ -134,12 +134,15 @@ module.exports = Self => {
                     throw new UserError('Ticket is already signed');
 
                 if (location) await setLocation(ticketId);
-                if (!await hasSignDms(ticketId)) await createGestDoc(ticketId);
+                if (!await hasSignDms(ticketId) && !isSignUploaded)
+                    await createGestDoc(ticketId);
+                if (isSignUploaded)
+                    await models.TicketDms.create({ticketFk: ticket.id, dmsFk: dms[0].id}, myOptions);
                 await ticket.updateAttribute('isSigned', true, myOptions);
 
                 const deliveryState = await models.State.findOne({
                     where: {code: 'DELIVERED'}
-                });
+                }, myOptions);
 
                 await models.Ticket.state(ctx, {
                     ticketFk: ticketId,