The user's profile might not be ready even if we have an active user

chrome/browser/ui/ash/chrome_shell_delegate.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/ash/chrome_shell_delegate.h"
 
 #include <stddef.h>
 
 #include <limits>
 
@@ skipping 543 matching lines @@
 }
 
 gfx::Image ChromeShellDelegate::GetDeprecatedAcceleratorImage() const {
   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(
       IDR_BLUETOOTH_KEYBOARD);
 }
 
 PrefService* ChromeShellDelegate::GetActiveUserPrefService() const {
   const user_manager::User* const user =
       user_manager::UserManager::Get()->GetActiveUser();
-  return user ? chromeos::ProfileHelper::Get()
-                    ->GetProfileByUser(user)
-                    ->GetPrefs()
-              : nullptr;
+  if (!user)
+    return nullptr;
+
+  // The user's profile might not be ready yet, so we must check for that too.
+  Profile* profile = chromeos::ProfileHelper::Get()->GetProfileByUser(user);
+  return profile ? profile->GetPrefs() : nullptr;
 }
 
 bool ChromeShellDelegate::IsTouchscreenEnabledInPrefs(
     bool use_local_state) const {
   return chromeos::system::InputDeviceSettings::Get()
       ->IsTouchscreenEnabledInPrefs(use_local_state);
 }
 
 void ChromeShellDelegate::SetTouchscreenEnabledInPrefs(bool enabled,
                                                        bool use_local_state) {
@@ skipping 65 matching lines @@
       NOTREACHED() << "Unexpected notification " << type;
   }
 }
 
 void ChromeShellDelegate::PlatformInit() {
   registrar_.Add(this, chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
 }