diff --git a/tiny_gltf.h b/tiny_gltf.h
index eede133..0b4a1d9 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -6147,12 +6147,19 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
 
         const auto bufferView =
             model->accessors[size_t(primitive.indices)].bufferView;
-        // bufferView could be null(-1) for certain extensions
-        if (bufferView >= 0 && bufferView < model->bufferViews.size()) {
+        if (bufferView < 0) {
+          // skip, bufferView could be null(-1) for certain extensions
+        } else if (size_t(bufferView) >= model->bufferViews.size()) { 
+          if (err) {
+            (*err) += "accessor[" + std::to_string(primitive.indices) +
+                      "] invalid bufferView";
+          }
+          return false;
+        } else {
           model->bufferViews[size_t(bufferView)].target =
               TINYGLTF_TARGET_ELEMENT_ARRAY_BUFFER;
-          // we could optionally check if accessors' bufferView type is Scalar,
-          // as it should be
+          // we could optionally check if accessors' bufferView type is Scalar, as
+          // it should be
         }
       }