diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Person.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Person.kt
index f08b161e..af5e045c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Person.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Person.kt
@@ -6,9 +6,9 @@ open class Person
 @Suppress("LongParameterList")
 constructor(
     type: List<String> = emptyList(),
-    override val name: String,
+    val name: String?,
     override val id: String,
-    var preferredUsername: String?,
+    var preferredUsername: String,
     var summary: String?,
     var inbox: String,
     var outbox: String,
@@ -19,7 +19,7 @@ constructor(
     var followers: String?,
     var following: String?,
     val manuallyApprovesFollowers: Boolean? = false
-) : Object(add(type, "Person")), HasId, HasName {
+) : Object(add(type, "Person")), HasId {
 
     @Suppress("CyclomaticComplexMethod", "CognitiveComplexMethod")
     override fun equals(other: Any?): Boolean {
@@ -67,20 +67,20 @@ constructor(
 
     override fun toString(): String {
         return "Person(" +
-            "name='$name', " +
-            "id='$id', " +
-            "preferredUsername=$preferredUsername, " +
-            "summary=$summary, " +
-            "inbox='$inbox', " +
-            "outbox='$outbox', " +
-            "url='$url', " +
-            "icon=$icon, " +
-            "publicKey=$publicKey, " +
-            "endpoints=$endpoints, " +
-            "followers=$followers, " +
-            "following=$following, " +
-            "manuallyApprovesFollowers=$manuallyApprovesFollowers" +
-            ")" +
-            " ${super.toString()}"
+                "name='$name', " +
+                "id='$id', " +
+                "preferredUsername=$preferredUsername, " +
+                "summary=$summary, " +
+                "inbox='$inbox', " +
+                "outbox='$outbox', " +
+                "url='$url', " +
+                "icon=$icon, " +
+                "publicKey=$publicKey, " +
+                "endpoints=$endpoints, " +
+                "followers=$followers, " +
+                "following=$following, " +
+                "manuallyApprovesFollowers=$manuallyApprovesFollowers" +
+                ")" +
+                " ${super.toString()}"
     }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
index 3b540ebb..009c6821 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
@@ -96,7 +96,7 @@ class APUserServiceImpl(
                     name = person.preferredUsername
                         ?: throw IllegalActivityPubObjectException("preferredUsername is null"),
                     domain = id.substringAfter("://").substringBefore("/"),
-                    screenName = person.name,
+                    screenName = person.name ?: person.preferredUsername,
                     description = person.summary.orEmpty(),
                     inbox = person.inbox,
                     outbox = person.outbox,