From 96c4beda19d8c58a8aab451ca4ede06ee4e071d8 Mon Sep 17 00:00:00 2001
From: Jonah Graham <jonah@kichwacoders.com>
Date: Wed, 28 May 2025 16:41:05 -0400
Subject: [PATCH] Fix NPE when viewer control doesn't adapt to
 CompareConfiguration

Follow up to
https://github.com/eclipse-platform/eclipse.platform.ui/pull/2629

which introduced an NPE when doing refactor->rename in CDT:
https://github.com/eclipse-cdt/cdt/issues/1172
---
 .../ltk/internal/ui/refactoring/PreviewWizardPage.java        | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/bundles/org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/PreviewWizardPage.java b/bundles/org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/PreviewWizardPage.java
index 95c263e4332..6d086c801b2 100644
--- a/bundles/org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/PreviewWizardPage.java
+++ b/bundles/org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/PreviewWizardPage.java
@@ -673,7 +673,9 @@ private void showPreview(PreviewNode element) {
 						if (container != null) {
 							if (newViewer.getControl() instanceof IAdaptable adaptable) {
 								CompareConfiguration config = adaptable.getAdapter(CompareConfiguration.class);
-								config.setContainer(new WizardCompareContainer(container));
+								if (config != null) {
+									config.setContainer(new WizardCompareContainer(container));
+								}
 							}
 						}
 					} else {