diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalFunctionSet.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalFunctionSet.java
index d04aae645f7..16b19aa647e 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalFunctionSet.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalFunctionSet.java
@@ -134,6 +134,8 @@ public class EvalFunctionSet extends CPPDependentEvaluation {
 	
 	@Override
 	public boolean isConstantExpression(IASTNode point) {
+		if (fFunctionSet == null)
+			return false;
 		for (ICPPFunction f : fFunctionSet.getBindings()) {
 			if (!f.isConstexpr()) {
 				return false;