1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/IR/Metadata.cpp b/llvm/lib/IR/Metadata.cpp
index ab83252bfda..2c6b332dc8e 100644
--- a/llvm/lib/IR/Metadata.cpp
+++ b/llvm/lib/IR/Metadata.cpp
@@ -167,6 +167,11 @@ void ReplaceableMetadataImpl::replaceAllUsesWith(Metadata *MD) {
     return L.second.second < R.second.second;
   });
   for (const auto &Pair : Uses) {
+    // Check that this Ref hasn't disappeared after RAUW (when updating a
+    // previous Ref).
+    if (!UseMap.count(Pair.first))
+      continue;
+
     OwnerTy Owner = Pair.second.first;
     if (!Owner) {
       // Update unowned tracking references directly.