diff --git a/0-collect-data/rdg.py b/0-collect-data/rdg.py
index 67d64a8f59ddf17949a5bd1d5680b66afd32a68e..f0f7f22c864d856d43d8001a49dc79301e30f1cb 100644
--- a/0-collect-data/rdg.py
+++ b/0-collect-data/rdg.py
@@ -59,7 +59,7 @@ def get_dois(results):
         nb_dois += len(num_dois)
 
         for item in num_dois :
-            dois.append(item["global_id"])
+            dois.append(item.get("global_id"))
         
     print("\tnb DOIs\t\t" + str(nb_dois))
     return dois