From 11463c5a0b21d91783e24844d068115d6689e827 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <lukec@alleninstitute.org>
Date: Fri, 4 May 2018 11:42:37 -0700
Subject: [PATCH] Fix: mkQApp returned None if a QApplication was already
 created elsewhere

---
 pyqtgraph/Qt.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pyqtgraph/Qt.py b/pyqtgraph/Qt.py
index 8c0041df..4ce571cc 100644
--- a/pyqtgraph/Qt.py
+++ b/pyqtgraph/Qt.py
@@ -276,7 +276,8 @@ if m is not None and list(map(int, m.groups())) < versionReq:
 
 QAPP = None
 def mkQApp():
-    global QAPP
-    if QtGui.QApplication.instance() is None:
+    global QAPP    
+    QAPP = QtGui.QApplication.instance()
+    if QAPP is None:
         QAPP = QtGui.QApplication([])
     return QAPP