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

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index ca5956b76987ffe576cd62a964fe60de90743c75..b550ad2e967d17fd79e488c9f81b614caf89f402 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -561,10 +561,12 @@ gfx::Image ChromeShellDelegate::GetDeprecatedAcceleratorImage() const {
 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(