1 files changed, 4 insertions, 2 deletions
diff --git a/remote_worker.py b/remote_worker.py
index c04ac65..0086c40 100755
--- a/remote_worker.py
+++ b/remote_worker.py
@@ -83,6 +83,7 @@ def main() -> None:
     in_file = config.config['code_file']
     out_file = config.config['result_file']
 
+    stop_thread = None
     if config.config['watch_for_cancel']:
         (thread, stop_thread) = watch_for_cancel()
 
@@ -130,8 +131,9 @@ def main() -> None:
         stop_thread.set()
         sys.exit(-1)
 
-    stop_thread.set()
-    thread.join()
+    if stop_thread is not None:
+        stop_thread.set()
+        thread.join()
 
 
 if __name__ == '__main__':