From 3d9f42ee9c4466b276cf8b198126d3ce21745324 Mon Sep 17 00:00:00 2001
From: Henry Pinkard <7969470+henrypinkard@users.noreply.github.com>
Date: Fri, 29 Sep 2023 10:13:13 -0700
Subject: [PATCH] avoid exception when only some channels present

---
 pom.xml                                                        | 2 +-
 .../ndviewer/internal/gui/contrast/MultiChannelHistograms.java | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pom.xml b/pom.xml
index 987511a..9cc1b38 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.micro-manager.ndviewer</groupId>
     <artifactId>NDViewer</artifactId>
-    <version>0.10.1</version>
+    <version>0.10.2</version>
     <packaging>jar</packaging>
     <name>NDViewer image viewer</name>
     <description>Java-based multidimensional image viewer</description>
diff --git a/src/main/java/org/micromanager/ndviewer/internal/gui/contrast/MultiChannelHistograms.java b/src/main/java/org/micromanager/ndviewer/internal/gui/contrast/MultiChannelHistograms.java
index 30a40b6..f34c3be 100644
--- a/src/main/java/org/micromanager/ndviewer/internal/gui/contrast/MultiChannelHistograms.java
+++ b/src/main/java/org/micromanager/ndviewer/internal/gui/contrast/MultiChannelHistograms.java
@@ -164,6 +164,9 @@ void updateHistogramData(HashMap<String, int[]> hists) {
          for (String i : hists.keySet()) {
             ChannelControlPanel c = ccpList_.get(i);
             int[] hist = hists.get(i);
+            if (hist == null) {
+               continue; // not provided for this channel
+            }
             c.updateHistogram(hist);
          }
       }