diff --git a/pixivmodels.cpp b/pixivmodels.cpp
index 67fc17c..f9f1d77 100644
--- a/pixivmodels.cpp
+++ b/pixivmodels.cpp
@@ -92,7 +92,9 @@ void from_json(const nlohmann::json& j, Illust& illust) {
     bool full_data = j.contains("illust_details");
     const nlohmann::json& author_details = j.at("author_details");
     const nlohmann::json& illust_details = full_data ? j.at("illust_details") : j;
-    const nlohmann::json& images_metadata = illust_details.at("illust_images");
+    std::optional<nlohmann::json> images_metadata = illust_details.contains("illust_images")
+        ? std::optional(illust_details["illust_images"])
+        : std::nullopt;
 
     author_details.at("user_account").get_to(illust.username);
     author_details.at("user_name").get_to(illust.user_display_name);
@@ -118,10 +120,10 @@ void from_json(const nlohmann::json& j, Illust& illust) {
         illust.images.reserve(manga_a.size());
 
         for (size_t i = 0; i < manga_a.size(); i++) {
-            illust.images.push_back(get_illust_images(manga_a[i], images_metadata.at(i)));
+            illust.images.push_back(get_illust_images(manga_a[i], images_metadata ? std::optional(images_metadata->at(i)) : std::nullopt));
         }
     } else {
-        illust.images = {get_illust_images(illust_details, images_metadata.at(0))};
+        illust.images = {get_illust_images(illust_details, images_metadata ? std::optional(images_metadata->at(0)) : std::nullopt)};
     }
     illust.page_count = to_ull(illust_details.at("page_count").get_ref<const nlohmann::json::string_t&>());
 }