diff --git a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/SemanticHighlightingReconciler.java b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/SemanticHighlightingReconciler.java
index a92a05d8be8..72880716f8b 100644
--- a/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/SemanticHighlightingReconciler.java
+++ b/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/SemanticHighlightingReconciler.java
@@ -512,7 +512,7 @@ private void updatePresentation(TextPresentation textPresentation, List<Position
 		IDocument document= fSourceViewer.getDocument();
 		display.asyncExec(() -> {
 			// check Editor not reused otherwise meanwhile
-			if (document == fSourceViewer.getDocument()) {
+			if (fSourceViewer != null && document == fSourceViewer.getDocument()) {
 				runnable.run();
 			}
 		});