Add check for user in cros settings handler

chrome/browser/ui/webui/options/chromeos/cros_language_options_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/options/chromeos/cros_language_options_handler.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 376 matching lines @@
 base::string16 CrosLanguageOptionsHandler::GetProductName() {
   return l10n_util::GetStringUTF16(IDS_SHORT_PRODUCT_OS_NAME);
 }
 
 void CrosLanguageOptionsHandler::SetApplicationLocale(
     const std::string& language_code) {
   Profile* profile = Profile::FromWebUI(web_ui());
   UserManager* user_manager = UserManager::Get();
 
   // Only the primary user can change the locale.
-  if (user_manager->GetUserByProfile(profile)->email() ==
-      user_manager->GetPrimaryUser()->email()) {
+  User* user = user_manager->GetUserByProfile(profile);
+  if (user && user->email() == user_manager->GetPrimaryUser()->email()) {
     profile->ChangeAppLocale(language_code,
                              Profile::APP_LOCALE_CHANGED_VIA_SETTINGS);
   }
 }
 
 void CrosLanguageOptionsHandler::RestartCallback(const base::ListValue* args) {
   content::RecordAction(UserMetricsAction("LanguageOptions_SignOut"));
   chrome::AttemptUserExit();
 }
 
@@ skipping 84 matching lines @@
       ConvertInputMethodDescriptosToIMEList(
           component_extension_manager->GetAllIMEAsInputMethodDescriptor()));
   web_ui()->CallJavascriptFunction(
       "options.LanguageOptions.onComponentManagerInitialized",
       *ime_list);
   composition_extension_appended_ = true;
 }
 
 }  // namespace options
 }  // namespace chromeos