--- a/eric6/DebugClients/Python/DebugClientBase.py	Sat Jul 03 11:47:48 2021 +0200
+++ b/eric6/DebugClients/Python/DebugClientBase.py	Sat Sep 04 11:34:54 2021 +0200
@@ -922,6 +922,7 @@
                 self.cover.start()
             self.debugging = params["debug"]
             if params["debug"]:
+                self.multiprocessSupport = False
                 locals_ = locals()
                 self.threads.clear()
                 self.attachThread(mainThread=True)