diff --git a/tiny_gltf.h b/tiny_gltf.h
index 174dbfc..8a4554b 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -5803,20 +5803,27 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
       }
 
       for (auto &attribute : primitive.attributes) {
-        model
-            ->bufferViews[size_t(
-                model->accessors[size_t(attribute.second)].bufferView)]
-            .target = TINYGLTF_TARGET_ARRAY_BUFFER;
+        const auto accessorsIndex = size_t(attribute.second);
+        if (accessorsIndex < model->accessors.size()) {
+          const auto bufferView = model->accessors[accessorsIndex].bufferView;
+          // bufferView could be null(-1) for sparse morph target
+          if (bufferView >= 0 && bufferView < model->bufferViews.size()) {
+            model->bufferViews[size_t(bufferView)].target =
+                TINYGLTF_TARGET_ARRAY_BUFFER;
+          }
+        }
       }
 
       for (auto &target : primitive.targets) {
         for (auto &attribute : target) {
-          auto bufferView =
-              model->accessors[size_t(attribute.second)].bufferView;
-          // bufferView could be null(-1) for sparse morph target
-          if (bufferView >= 0) {
-            model->bufferViews[size_t(bufferView)].target =
-                TINYGLTF_TARGET_ARRAY_BUFFER;
+          const auto accessorsIndex = size_t(attribute.second);
+          if (accessorsIndex < model->accessors.size()) {
+            const auto bufferView = model->accessors[accessorsIndex].bufferView;
+            // bufferView could be null(-1) for sparse morph target
+            if (bufferView >= 0 && bufferView < model->bufferViews.size()) {
+              model->bufferViews[size_t(bufferView)].target =
+                  TINYGLTF_TARGET_ARRAY_BUFFER;
+            }
           }
         }
       }