diff --git a/modules/supplier/back/methods/supplier/updateFiscalData.js b/modules/supplier/back/methods/supplier/updateFiscalData.js
index 4b2573dba..366b5c29e 100644
--- a/modules/supplier/back/methods/supplier/updateFiscalData.js
+++ b/modules/supplier/back/methods/supplier/updateFiscalData.js
@@ -13,7 +13,7 @@ module.exports = Self => {
             type: 'string'
         }, {
             arg: 'nif',
-            type: 'string'
+            type: 'any'
         }, {
             arg: 'account',
             type: 'any'
@@ -37,7 +37,7 @@ module.exports = Self => {
             type: 'any'
         }, {
             arg: 'city',
-            type: 'string'
+            type: 'any'
         }, {
             arg: 'provinceFk',
             type: 'any'
@@ -87,11 +87,11 @@ module.exports = Self => {
             }
         }
 
-        if (!city) {
+        if (city === null) {
             throw new UserError('The city cannot be empty'
             );
         }
-        if (!nif) {
+        if (nif === null) {
             throw new UserError('The nif cannot be empty'
             );
         }