diff --git a/src/contact/mod.rs b/src/contact/mod.rs
index 33a6f2b..e69ec58 100644
--- a/src/contact/mod.rs
+++ b/src/contact/mod.rs
@@ -3,7 +3,7 @@ use serde::{Deserialize, Serialize};
 #[derive(Clone, Debug, Default, Deserialize, Serialize)]
 pub struct Contact {
     #[serde(skip_serializing_if = "crate::init::is_uuid_nil")]
-    pub id: uuid::Uuid,
+    pub id: Option<uuid::Uuid>,
     // empty?
     #[serde(skip_serializing_if = "String::is_empty")]
     pub firstname: String,
@@ -16,5 +16,5 @@ pub struct Contact {
     pub phone_number: String,
     // empty
     #[serde(skip_serializing_if = "crate::init::is_uuid_nil")]
-    pub user_id: uuid::Uuid,
+    pub user_id: Option<uuid::Uuid>,
 }
diff --git a/src/lib.rs b/src/lib.rs
index bed7751..8d0b5f9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,14 @@ pub mod token;
 pub mod user;
 
 pub mod init {
-    pub fn is_uuid_nil(uuid: &uuid::Uuid) -> bool {
-        uuid.is_nil()
+    pub fn is_uuid_nil(uuid: &Option<uuid::Uuid>) -> bool {
+        match uuid {
+            Some(id) => {
+                id.is_nil()
+            }
+            None => {
+                true
+            }
+        }
     }
 }