diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/doctools/AbstractDocCommentProposalComputer.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/doctools/AbstractDocCommentProposalComputer.java
index d245f88af32..d00becc5be3 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/doctools/AbstractDocCommentProposalComputer.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/doctools/AbstractDocCommentProposalComputer.java
@@ -65,6 +65,9 @@ abstract class AbstractDocCommentProposalComputer implements ICompletionProposal
 	
 	private static IResource getResource() {
 		ITranslationUnit tu= getTranslationUnit();
+		if (tu == null)
+			return null;
+		
 		return tu.getResource();
 	}