diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/editor/CEditor.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/editor/CEditor.java
index 8c7b687687d..27b9062ad22 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/editor/CEditor.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/editor/CEditor.java
@@ -1366,7 +1366,10 @@ public class CEditor extends AbstractTextEditor implements ISelectionChangedList
 			 * Uninstalls this manager.
 			 */
 			private void uninstall() {
-				getTextWidget().removeVerifyKeyListener(this);
+				StyledText textWidget = getTextWidget();
+				if (textWidget != null && !textWidget.isDisposed()) {
+					textWidget.removeVerifyKeyListener(this);
+				}
 			}
 		};