diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
index f47402a..dc8166a 100644
--- a/Lib/multiprocessing/managers.py
+++ b/Lib/multiprocessing/managers.py
@@ -548,7 +548,10 @@
         '''
         Join the manager process (if it has been spawned)
         '''
-        self._process.join(timeout)
+        if self._process is not None:
+            self._process.join(timeout)
+            if not self._process.is_alive():
+                self._process = None
 
     def _debug_info(self):
         '''
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index 792db25..4a74e87 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -2516,6 +2516,7 @@
 
     def tearDown(self):
         self.mgr.shutdown()
+        self.mgr.join()
 
     def test_manager_initializer(self):
         m = multiprocessing.managers.SyncManager()
@@ -2523,6 +2524,7 @@
         m.start(initializer, (self.ns,))
         self.assertEqual(self.ns.test, 1)
         m.shutdown()
+        m.join()
 
     def test_pool_initializer(self):
         self.assertRaises(TypeError, multiprocessing.Pool, initializer=1)
@@ -2818,6 +2820,7 @@
         ManagerMixin.pool.terminate()
         ManagerMixin.pool.join()
         ManagerMixin.manager.shutdown()
+        ManagerMixin.manager.join()
         ThreadsMixin.pool.join()
         ProcessesMixin.pool.join()
         del ProcessesMixin.pool, ThreadsMixin.pool, ManagerMixin.pool