diff --git a/R/importOutput.R b/R/importOutput.R
index 6d41e83e..38612ff4 100644
--- a/R/importOutput.R
+++ b/R/importOutput.R
@@ -985,9 +985,10 @@
   }
   
   endpoint <- paste0(endpoint_root, frequency_url, columns_url, links_url, mc_years_url)
-  res <- api_get(opts = opts,
-            endpoint = endpoint,
-            default_endpoint = "v1/studies")
+  res <- api_get(opts = opts, endpoint = endpoint, default_endpoint = "v1/studies")
+  
+  attr(res, "spec") <- NULL
+  attr(res, "problems") <- NULL
   
   return(as.data.table(res))
 }