From 6126064790d87e706f005e71b78328310186ece3 Mon Sep 17 00:00:00 2001
From: "Donald J. Olbris" <olbrisd@janelia.hhmi.org>
Date: Mon, 17 Mar 2025 09:20:45 -0400
Subject: [PATCH] fix NPE in blank 3d view; no sample = no notifications

---
 .../main/java/org/janelia/scenewindow/SceneInteractor.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/SceneWindow/src/main/java/org/janelia/scenewindow/SceneInteractor.java b/modules/SceneWindow/src/main/java/org/janelia/scenewindow/SceneInteractor.java
index 9c5272609..6f843b7cc 100644
--- a/modules/SceneWindow/src/main/java/org/janelia/scenewindow/SceneInteractor.java
+++ b/modules/SceneWindow/src/main/java/org/janelia/scenewindow/SceneInteractor.java
@@ -37,6 +37,10 @@ public SceneInteractor(AbstractCamera camera, Component component) {
     public abstract String getToolTipText();
     
     public void notifyObservers() {
+        if (TmModelManager.getInstance().getCurrentSample() == null)
+            // no sample, no notifications
+            return;
+
         camera.getVantage().notifyObservers();
         Vantage vantage = camera.getVantage();
         Matrix m2v = TmModelManager.getInstance().getMicronToVoxMatrix();