From ad20103ccca980dbef23987bfed5406dc66d91a0 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <luke.campagnola@gmail.com>
Date: Sun, 17 Mar 2013 14:26:23 -0400
Subject: [PATCH] Check for length=0 arrays when using autoVisible

---
 pyqtgraph/graphicsItems/PlotCurveItem.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/graphicsItems/PlotCurveItem.py b/pyqtgraph/graphicsItems/PlotCurveItem.py
index c5a8ec3f..d707a347 100644
--- a/pyqtgraph/graphicsItems/PlotCurveItem.py
+++ b/pyqtgraph/graphicsItems/PlotCurveItem.py
@@ -112,7 +112,10 @@ class PlotCurveItem(GraphicsObject):
         if orthoRange is not None:
             mask = (d2 >= orthoRange[0]) * (d2 <= orthoRange[1])
             d = d[mask]
-            d2 = d2[mask]
+            #d2 = d2[mask]
+            
+        if len(d) == 0:
+            return (None, None)
 
         ## Get min/max (or percentiles) of the requested data range
         if frac >= 1.0: