From 100a39afd95d6e914d029e356b622e551087952d Mon Sep 17 00:00:00 2001
From: marcel <marcel.paffrath@rub.de>
Date: Mon, 14 Aug 2017 13:56:08 +0200
Subject: [PATCH] [bugfix] prevent error on mousewheel zoom outside axis

---
 pylot/core/util/widgets.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pylot/core/util/widgets.py b/pylot/core/util/widgets.py
index 1d42ce7a..c76480f6 100644
--- a/pylot/core/util/widgets.py
+++ b/pylot/core/util/widgets.py
@@ -1910,6 +1910,9 @@ class PickDlg(QDialog):
 
     def scrollZoom(self, gui_event, factor=2.):
 
+        if not gui_event.xdata or not gui_event.ydata:
+            return
+
         self.updateCurrentLimits()
 
         if gui_event.button == 'up':