diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index fd5d07f..769e326 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -1092,16 +1092,17 @@
   }
 }
 
-const std::vector<uint32_t> AssetManager2::GetBagResIdStack(uint32_t resid) const {
-  auto cached_iter = cached_bag_resid_stacks_.find(resid);
-  if (cached_iter != cached_bag_resid_stacks_.end()) {
-    return cached_iter->second;
+base::expected<const std::vector<uint32_t>*, NullOrIOError> AssetManager2::GetBagResIdStack(
+    uint32_t resid) const {
+  auto [it, inserted] = cached_bag_resid_stacks_.try_emplace(resid);
+  if (inserted) {
+    // This is a new entry in the cache, need to populate it.
+    if (auto maybe_bag = GetBag(resid, it->second); !maybe_bag.ok()) {
+      cached_bag_resid_stacks_.erase(it);
+      return base::unexpected(maybe_bag.error());
+    }
   }
-
-  std::vector<uint32_t> found_resids;
-  GetBag(resid, found_resids);
-  cached_bag_resid_stacks_.emplace(resid, found_resids);
-  return found_resids;
+  return &it->second;
 }
 
 base::expected<const ResolvedBag*, NullOrIOError> AssetManager2::ResolveBag(
@@ -1120,7 +1121,7 @@
 base::expected<const ResolvedBag*, NullOrIOError> AssetManager2::GetBag(uint32_t resid) const {
   std::vector<uint32_t> found_resids;
   const auto bag = GetBag(resid, found_resids);
-  cached_bag_resid_stacks_.emplace(resid, std::move(found_resids));
+  cached_bag_resid_stacks_.try_emplace(resid, std::move(found_resids));
   return bag;
 }
 
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index cedf732..f611d0d 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -243,9 +243,14 @@
     friend AssetManager2;
     friend Theme;
     SelectedValue() = default;
-    SelectedValue(const ResolvedBag* bag, const ResolvedBag::Entry& entry) :
-        cookie(entry.cookie), data(entry.value.data), type(entry.value.dataType),
-        flags(bag->type_spec_flags), resid(0U), config({}) {};
+    SelectedValue(const ResolvedBag* bag, const ResolvedBag::Entry& entry)
+        : cookie(entry.cookie),
+          data(entry.value.data),
+          type(entry.value.dataType),
+          flags(bag->type_spec_flags),
+          resid(0U),
+          config() {
+    }
 
     // The cookie representing the ApkAssets in which the value resides.
     ApkAssetsCookie cookie = kInvalidCookie;
@@ -327,7 +332,8 @@
   // resource data failed.
   base::expected<uint32_t, NullOrIOError> GetResourceTypeSpecFlags(uint32_t resid) const;
 
-  const std::vector<uint32_t> GetBagResIdStack(uint32_t resid) const;
+  base::expected<const std::vector<uint32_t>*, NullOrIOError> GetBagResIdStack(
+      uint32_t resid) const;
 
   // Resets the resource resolution structures in preparation for the next resource retrieval.
   void ResetResourceResolution() const;