From 0ad5f9587f3a14fd28548616948ef0f9fac6a2e2 Mon Sep 17 00:00:00 2001
From: Lawrence Lee <billee@ucdavis.edu>
Date: Sat, 26 Sep 2020 12:40:14 -0700
Subject: [PATCH] Fix segfault

Make sure histogramRGBArea isn't null before using it.
---
 rtgui/histogrampanel.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rtgui/histogrampanel.cc b/rtgui/histogrampanel.cc
index 68f0d91b6..93091733c 100644
--- a/rtgui/histogrampanel.cc
+++ b/rtgui/histogrampanel.cc
@@ -295,7 +295,9 @@ HistogramPanel::HistogramPanel () :
     
     type_changed();
     updateHistAreaOptions();
-    updateHistRGBAreaOptions();
+    if (histogramRGBArea) {
+        updateHistRGBAreaOptions();
+    }
 
     setExpandAlignProperties(showRed  , false, false, Gtk::ALIGN_START, Gtk::ALIGN_CENTER);
     setExpandAlignProperties(showGreen, false, false, Gtk::ALIGN_START, Gtk::ALIGN_CENTER);