diff --git a/django/contrib/sessions/backends/cache.py b/django/contrib/sessions/backends/cache.py
index 5fdf133b05..ab0716dcb4 100644
--- a/django/contrib/sessions/backends/cache.py
+++ b/django/contrib/sessions/backends/cache.py
@@ -43,7 +43,7 @@ class SessionStore(SessionBase):
             raise CreateError
 
     def exists(self, session_key):
-        if self._cache.get(session_key):
+        if self._cache.has_key(session_key):
             return True
         return False
 
diff --git a/django/contrib/sessions/tests.py b/django/contrib/sessions/tests.py
index d0fed280b5..f0a3c4ec8c 100644
--- a/django/contrib/sessions/tests.py
+++ b/django/contrib/sessions/tests.py
@@ -182,6 +182,11 @@ False
 False
 >>> cache_session.items() == prev_data
 True
+>>> cache_session = CacheSession()
+>>> cache_session.save()
+>>> key = cache_session.session_key
+>>> cache_session.exists(key)
+True
 
 >>> Session.objects.filter(pk=cache_session.session_key).delete()
 >>> cache_session = CacheSession(cache_session.session_key)