Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -11145,6 +11145,7 @@
   }
 
   if (LHSType->isVLSTBuiltinType() && RHSType->isVLSTBuiltinType() &&
+      LHSBuiltinTy && RHSBuiltinTy &&
       Context.getBuiltinVectorTypeInfo(LHSBuiltinTy).EC !=
           Context.getBuiltinVectorTypeInfo(RHSBuiltinTy).EC) {
     Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)