This closes #5

lib/zimbra-admin-api.js

@@ -13813,7 +13813,8 @@ return /******/ (function(modules) { // webpackBootstrap
 	    value: function getMailboxSize(callback) {
 	      this.getMailbox(function (e, d) {
 	        if (e) return callback(e);
-	        return callback(null, d.size);
+	        var size = d.size === undefined || d.size === null ? 0 : d.size;
+	        return callback(null, size);
 	      });
 	    }
 	  }, {

src/zimbra/account.js

@@ -34,7 +34,8 @@ export default class Account extends Zimbra {
     getMailboxSize(callback) {
       this.getMailbox(function(e,d){
         if (e) return callback(e);
-        return callback(null, d.size);
+        const size = ( d.size === undefined || d.size === null) ? 0 : d.size;
+        return callback(null, size);
       });
     }
 

test/js/spec/test.js

@@ -282,7 +282,7 @@
 
     it('Should Get The Account Mailbox', function(done){
       let api = new ZimbraAdminApi(auth_data);
-      api.getAccount('pbruna@itlinux.cl', function(err, data){
+      api.getAccount('cos_basic_14@customer.dev', function(err, data){
         let account = data;
         account.getMailbox(function(err, data){
           if (err) return console.log(err);
@@ -294,7 +294,7 @@
 
     it('Should Get The Account Mailbox Size', function(done){
       let api = new ZimbraAdminApi(auth_data);
-      api.getAccount('pbruna@itlinux.cl', function(err, data){
+      api.getAccount('cos_basic_14@customer.dev', function(err, data){
         let account = data;
         account.getMailboxSize(function(err, data){
           if (err) return console.log(err);