diff --git a/back/methods/collection/assign.js b/back/methods/collection/assign.js
index 0484eb5a8..9abeb46f5 100644
--- a/back/methods/collection/assign.js
+++ b/back/methods/collection/assign.js
@@ -20,9 +20,13 @@ module.exports = Self => {
         if (typeof options == 'object')
             Object.assign(myOptions, options);
 
-        const [, , [{collectionFk}]] =
-            await Self.rawSql('CALL vn.collection_assign(?, @vCollectionFk); SELECT @vCollectionFk collectionFk',
-                [userId], myOptions);
+        const result = await Self.rawSql(`
+            CALL vn.collection_assign(?, @vCollectionFk);
+            SELECT @vCollectionFk collectionFk
+            `, [userId], myOptions);
+
+        // Por si entra en el SELECT FOR UPDATE y retorna un array más
+        const collectionFk = result[2][0]?.collectionFk || result[3][0]?.collectionFk;
 
         if (!collectionFk) throw new UserError('There are not picking tickets');
         await Self.rawSql('CALL vn.collection_printSticker(?, NULL)', [collectionFk], myOptions);