schemas/popolo/membership.json in pupa-0.1.7 vs schemas/popolo/membership.json in pupa-0.1.8

@@ -17,10 +17,10 @@
       "description": "The role that the member fulfills in the organization",
       "type": ["string", "null"]
     },
     "member": {
       "description": "The person or organization that is a member of the organization",
-      "type": ["object"]
+      "type": ["object", "null"]
     },
     "person_id": {
       "description": "The ID of the person who is a member of the organization",
       "type": ["string", "null"]
     },