From 20229d639238212cf9a7e64305be8ac3f9cc8eaa Mon Sep 17 00:00:00 2001
From: hrdl <31923882+hrdl-github@users.noreply.github.com>
Date: Thu, 16 Nov 2023 00:05:08 +0100
Subject: [PATCH] Check for None in case we are dealing with an externally
 launched kernel

Fix #594.
---
 qtconsole/qtconsoleapp.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qtconsole/qtconsoleapp.py b/qtconsole/qtconsoleapp.py
index cee348d6..b93a9077 100644
--- a/qtconsole/qtconsoleapp.py
+++ b/qtconsole/qtconsoleapp.py
@@ -191,7 +191,7 @@ def new_frontend_master(self):
         # start the kernel
         kwargs = {}
         # FIXME: remove special treatment of IPython kernels
-        if self.kernel_manager.ipykernel:
+        if self.kernel_manager and self.kernel_manager.ipykernel:
             kwargs['extra_arguments'] = self.kernel_argv
         kernel_manager.start_kernel(**kwargs)
         kernel_manager.client_factory = self.kernel_client_class