From 6826e2615ce13a1a73cf3f5c3448e2b29ed319f7 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <luke.campagnola@gmail.com>
Date: Wed, 25 Jul 2018 10:07:24 -0700
Subject: [PATCH] Fix exit error caused by callback invoked during Qt teardown

---
 pyqtgraph/graphicsItems/GraphicsItem.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pyqtgraph/graphicsItems/GraphicsItem.py b/pyqtgraph/graphicsItems/GraphicsItem.py
index f88069bc..628b495b 100644
--- a/pyqtgraph/graphicsItems/GraphicsItem.py
+++ b/pyqtgraph/graphicsItems/GraphicsItem.py
@@ -445,6 +445,10 @@ class GraphicsItem(object):
         ## called to see whether this item has a new view to connect to
         ## NOTE: This is called from GraphicsObject.itemChange or GraphicsWidget.itemChange.
 
+        if not hasattr(self, '_connectedView'):
+            # Happens when Python is shutting down.
+            return
+
         ## It is possible this item has moved to a different ViewBox or widget;
         ## clear out previously determined references to these.
         self.forgetViewBox()