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-rw-r--r--lib/Expr/ExprBuilder.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Expr/ExprBuilder.cpp b/lib/Expr/ExprBuilder.cpp
index f8f57d35..2e5fcfbd 100644
--- a/lib/Expr/ExprBuilder.cpp
+++ b/lib/Expr/ExprBuilder.cpp
@@ -327,7 +327,7 @@ namespace {
                            const ref<Expr> &Index) {
       // Roll back through writes when possible.
       auto UN = Updates.head;
-      while (!UN.isNull() && Eq(Index, UN->index)->isFalse())
+      while (UN && Eq(Index, UN->index)->isFalse())
         UN = UN->next;
 
       if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Index))