From 78d3e8d3aba44f59f7ee389ea44fe5cadeabb29c Mon Sep 17 00:00:00 2001
From: Dan <46821332+nsadeveloper789@users.noreply.github.com>
Date: Thu, 14 Apr 2022 17:30:49 -0400
Subject: [PATCH] GP-1905: Fix NPE when changing register-tracking setting in
 dynamic listing.

---
 .../core/debug/gui/action/DebuggerTrackLocationTrait.java  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/DebuggerTrackLocationTrait.java b/Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/DebuggerTrackLocationTrait.java
index 32270ca5ad..f023da0417 100644
--- a/Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/DebuggerTrackLocationTrait.java
+++ b/Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/DebuggerTrackLocationTrait.java
@@ -191,8 +191,11 @@ public class DebuggerTrackLocationTrait {
 	}
 
 	public void setSpec(LocationTrackingSpec spec) {
-		// TODO: What if action == null?
-		if (action != null) {
+		if (action == null) {
+			// It might if the client doesn't need a new button, e.g., TraceDiff
+			doSetSpec(spec);
+		}
+		else {
 			action.setCurrentActionStateByUserData(spec);
 		}
 	}