diff --git a/python/helpers/pydev/pydevd.py b/python/helpers/pydev/pydevd.py
index dc290d3f7725..cc1107c8d260 100644
--- a/python/helpers/pydev/pydevd.py
+++ b/python/helpers/pydev/pydevd.py
@@ -2033,7 +2033,10 @@ def _locked_settrace(
         atexit.register(stoptrace)
 
         PyDBCommandThread(debugger).start()
-        CheckOutputThread(debugger).start()
+        if debugger.haveAliveThreads():
+            CheckOutputThread(debugger).start()
+        else:
+            PydevdLog(2, "Do not start CheckOutputThread in process", os.getpid())
         
         #Suspend as the last thing after all tracing is in place.
         if suspend: