Merge branch '3.0'

* 3.0: (24 commits)
  [Filesystem] Better error handling in remove()
  [DependencyInjection] Add coverage for invalid Expression in exportParameters
  [DependencyInjection] Add coverage for all invalid arguments in exportParameters
  anonymous services are always private
  [Form] FormValidator removed code related to removed  option
  [Console] Correct time formatting.
  [WebProfilerBundle] Fixed error from unset twig variable
  Force profiler toolbar svg display
  [DependencyInjection] Resolve aliases before removing abstract services + add tests
  Fix Dom Crawler select option with empty value
  Remove unnecessary option assignment
  fix tests (use non-deprecated options)
  remove unused variable
  mock the proper method
  [PropertyAccess] Fix regression
  [HttpFoundation] Improve phpdoc
  [Logging] Add support for firefox in ChromePhpHandler
  Windows 10 version check in just one line
  Detect CLI color support for Windows 10 build 10586
  [Security] Fixed SwitchUserListener when exiting an impersonication with AnonymousToken
  ...

1 files changed, 2 insertions, 1 deletions

diff --git a/Http/Firewall/SwitchUserListener.php b/Http/Firewall/SwitchUserListener.php
index 7c068fe..7de83d2 100644
--- a/Http/Firewall/SwitchUserListener.php
+++ b/Http/Firewall/SwitchUserListener.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
@@ -161,7 +162,7 @@ class SwitchUserListener implements ListenerInterface
             throw new AuthenticationCredentialsNotFoundException('Could not find original Token object.');
         }
 
-        if (null !== $this->dispatcher) {
+        if (null !== $this->dispatcher && $original->getUser() instanceof UserInterface) {
             $user = $this->provider->refreshUser($original->getUser());
             $switchEvent = new SwitchUserEvent($request, $user);
             $this->dispatcher->dispatch(SecurityEvents::SWITCH_USER, $switchEvent);