message: Need to check for extension existence before getting values.
diff: @@ -176,6 +176,8 @@ namespace ospray {
  // currently load BIT_asset_info extension with partial properties only
  // For reference links to work we need the 'id', 'type' and 'title'
  + auto fnd = asset.extensions.find("BIT_asset_info");
  + if (fnd != asset.extensions.end()) {
  auto &assetExt = asset.extensions["BIT_asset_info"];
  auto assetId = assetExt.Get("id").Get<std::string>();
  @@ -185,7 +187,7 @@ namespace ospray {
  sgNode->createChild("asset_id", "string", assetId);
  sgNode->createChild("asset_title", "string", assetTitle);
  sgNode->createChild("asset_type", "string", assetType);
  -
  + }
  }
  void GLTFData::addReferenceLinkInfo(const int nid, NodePtr sgNode) {
  