diff --git a/benchmark/torch/AlphaZero/README.md b/benchmark/torch/AlphaZero/README.md
index 72d9c807fb5066c51b49520b8aca3a5e666e133c..db782a455f7148cfce7eb85e28ce9a6b598631d7 100644
--- a/benchmark/torch/AlphaZero/README.md
+++ b/benchmark/torch/AlphaZero/README.md
@@ -5,7 +5,7 @@
 
 ### Dependencies
 - python3
-- [parl==1.3](https://github.com/PaddlePaddle/PARL)
+- [parl==1.3.2](https://github.com/PaddlePaddle/PARL)
 - torch
 - tqdm
 
diff --git a/parl/remote/worker.py b/parl/remote/worker.py
index e16e11d2345c80ff0c5f6f33a2296271c9a21c31..330bad26f6dcee8da212885d7cb122df3505900c 100644
--- a/parl/remote/worker.py
+++ b/parl/remote/worker.py
@@ -420,4 +420,5 @@ class Worker(object):
     def run(self):
         """Keep running until it lost connection with the master.
         """
-        self.reply_master_hearbeat_thread.join()
+        if self.worker_is_alive:
+            self.reply_master_hearbeat_thread.join()