diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
index f570442..8629a5f 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
@@ -56,7 +56,7 @@ fun Routing.apiCommandRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
@@ -89,7 +89,7 @@ fun Routing.apiCommandRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
@@ -127,7 +127,7 @@ fun Routing.apiCommandRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiDiscordRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiDiscordRoutes.kt
index c0f6637..69e67f0 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiDiscordRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiDiscordRoutes.kt
@@ -32,7 +32,7 @@ fun Route.apiDiscordRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
@@ -65,7 +65,7 @@ fun Route.apiDiscordRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
index c90637a..c7b9046 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
@@ -120,7 +120,7 @@ fun Routing.apiRoutes() {
             ))
 
             val subordinates = transaction {
-                user.subordinates.copy()
+                user.subordinates.toList()
             }
             returnUsers.addAll(subordinates.map {
                 val subStatus = it.token?.let { token -> ChzzkUserCache.getCachedUser(token) }
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
index 97f2291..6264545 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
@@ -29,7 +29,7 @@ fun Routing.apiTimerRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
@@ -56,7 +56,7 @@ fun Routing.apiTimerRoutes() {
             }
 
             val managers = transaction {
-                user.managers.copy()
+                user.managers.toList()
             }
             if(!managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")