From f818a270543f7b87ddb31238d31b80ff4b9255be Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Tue, 22 Jun 2021 16:57:03 -0400
Subject: do not draw scan position if we have no points to show

---
 eitControl.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/eitControl.py b/eitControl.py
index 1b4ed95..c8e7850 100644
--- a/eitControl.py
+++ b/eitControl.py
@@ -313,7 +313,8 @@ class Experiment:
                 self.channelGraph[name]=self.dataPlot.plot(x,y, pen=None, symbol='o', symbolPen=None, symbolBrush=color, symbolSize=5, name=name)
             else:
                 self.channelGraph[name].setData(x,y)
-        self.vLineSweepPosition.setValue(x[-1])
+        if len(x)>0:
+            self.vLineSweepPosition.setValue(x[-1])
         # centralFreqFormatted = pg.siFormat(self.fCent, suffix='Hz', precision=4)
         # showing trailing zeros is tricky
         fCent = self.rfGenFunc.getCenter()
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