From 2223e7ff679a4379c3c89ce41f435fe3f3d9833f 2014-06-09 22:32:37
From: MinRK <benjaminrk@gmail.com>
Date: 2014-06-09 22:32:37
Subject: [PATCH] don’t trigger call tips with no shell channel

can raise RuntimeError during shutdown
---

diff --git a/IPython/qt/console/frontend_widget.py b/IPython/qt/console/frontend_widget.py
index e67c377..ef5137c 100644
--- a/IPython/qt/console/frontend_widget.py
+++ b/IPython/qt/console/frontend_widget.py
@@ -716,7 +716,7 @@ class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):
         """ Shows a call tip, if appropriate, at the current cursor location.
         """
         # Decide if it makes sense to show a call tip
-        if not self.enable_calltips:
+        if not self.enable_calltips or not self.kernel_client.shell_channel.is_alive():
             return False
         cursor_pos = self._get_input_buffer_cursor_pos()
         code = self.input_buffer