diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/GoToNextPreviousMemberAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/GoToNextPreviousMemberAction.java
index 686e1cfed9f..6775facb559 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/GoToNextPreviousMemberAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/GoToNextPreviousMemberAction.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2005, 2006 IBM Corporation and others.
+ * Copyright (c) 2005, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -85,6 +85,9 @@ public class GoToNextPreviousMemberAction extends TextEditorAction {
         final ITextSelection selection = (ITextSelection) editor.getSelectionProvider().getSelection();
         final IEditorInput editorInput = editor.getEditorInput();
         final IWorkingCopy workingCopy =  CUIPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(editorInput);
+        if (workingCopy == null) {
+        	return;
+        }
         try {
             final ICElement[] elements =  workingCopy.getChildren();
             final Integer[] elementOffsets = createSourceIndexes(elements);
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CReconciler.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CReconciler.java
index 9078132ce79..674bac7d8a6 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CReconciler.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CReconciler.java
@@ -433,7 +433,7 @@ public class CReconciler extends MonoReconciler {
 			IEditorInput input= fTextEditor.getEditorInput();
 			IWorkingCopyManager manager= CUIPlugin.getDefault().getWorkingCopyManager();				
 			IWorkingCopy copy= manager.getWorkingCopy(input);
-			if (copy.getOriginalElement().equals(element)) {
+			if (copy == null || copy.getOriginalElement().equals(element)) {
 				return false;
 			}
 			return isRelevantProject(copy.getCProject());
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/CContentAssistInvocationContext.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/CContentAssistInvocationContext.java
index 63b6f66bc9a..670f13f41ab 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/CContentAssistInvocationContext.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/CContentAssistInvocationContext.java
@@ -109,6 +109,9 @@ public class CContentAssistInvocationContext extends ContentAssistInvocationCont
 		
 		fCNComputed = true;
 		
+		if (fTU == null) {
+			return null;
+		}
 		int offset = getParseOffset();
 		if (offset < 0) return null;