diff --git a/misp_modules/modules/expansion/vulnerability_lookup.py b/misp_modules/modules/expansion/vulnerability_lookup.py
index 717f03c3..ebcf7e3f 100644
--- a/misp_modules/modules/expansion/vulnerability_lookup.py
+++ b/misp_modules/modules/expansion/vulnerability_lookup.py
@@ -225,7 +225,8 @@ class VulnerabilityLookupParser(VulnerabilityParser):
         misp_object = MISPObject('vulnerability')
         gsd_details = lookup_result['gsd']['osvSchema']
         for field, relation in self.mapping.gsd_mapping().items():
-            misp_object.add_attribute(relation, gsd_details[field])
+            if gsd_details.get(field):
+                misp_object.add_attribute(relation, gsd_details[field])
         misp_object.add_reference(self.misp_attribute.uuid, 'related-to')
         vulnerability_object = self.misp_event.add_object(misp_object)