--- a/eric6/E5Network/E5JsonServer.py Mon May 10 18:37:54 2021 +0200 +++ b/eric6/E5Network/E5JsonServer.py Mon May 10 18:45:32 2021 +0200 @@ -290,7 +290,8 @@ if idString: with contextlib.suppress(KeyError): - self .__clientProcesses[idString].close() + if self .__clientProcesses[idString] is not None: + self .__clientProcesses[idString].close() del self.__clientProcesses[idString] else: if self.__clientProcess is not None: