diff --git a/src/compiler/parseConst.cpp b/src/compiler/parseConst.cpp
index 9a8a50c..421d31f 100644
--- a/src/compiler/parseConst.cpp
+++ b/src/compiler/parseConst.cpp
@@ -151,6 +151,13 @@
 
 void TConstTraverser::visitConstantUnion(TIntermConstantUnion* node)
 {
+    if (!node->getUnionArrayPointer())
+    {
+        // The constant was not initialized, this should already have been logged
+        assert(infoSink.info.size() != 0);
+        return;
+    }
+
     ConstantUnion* leftUnionArray = unionArray;
     int instanceSize = type.getObjectSize();