fix: id list must not contain null values

program/serializers.py

@@ -338,7 +338,7 @@ class HostSerializer(serializers.ModelSerializer):
     )
     links = HostLinkSerializer(many=True, required=False)
     owner_ids = serializers.PrimaryKeyRelatedField(
-        allow_null=True, many=True, queryset=User.objects.all(), source="owners"
+        many=True, queryset=User.objects.all(), source="owners"
     )
 
     class Meta: