diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/InclusionProposalComputer.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/InclusionProposalComputer.java
index 2aa9e2b2ff3..1340187ed55 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/InclusionProposalComputer.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/contentassist/InclusionProposalComputer.java
@@ -123,6 +123,10 @@ public class InclusionProposalComputer implements ICompletionProposalComputer {
 		if (context.isContextInformationStyle()) {
 			return;
 		}
+		final ITranslationUnit tu= context.getTranslationUnit();
+		if (tu == null) {
+			return;
+		}
 		String prefix;
 		boolean angleBrackets= false;
 		prefix = computeIncludePrefix(context);
@@ -131,10 +135,9 @@ public class InclusionProposalComputer implements ICompletionProposalComputer {
 			prefix= prefix.substring(1);
 		}
 		IPath prefixPath= new Path(prefix);
-		final ITranslationUnit tu= context.getTranslationUnit();
 		String[] potentialIncludes= collectIncludeFiles(tu, prefixPath, angleBrackets);
 		if (potentialIncludes.length > 0) {
-			IInclude[] includes= context.getTranslationUnit().getIncludes();
+			IInclude[] includes= tu.getIncludes();
 			Set<String> alreadyIncluded= new HashSet<String>();
 			for (IInclude includeDirective : includes) {
 				alreadyIncluded.add(includeDirective.getElementName());