diff --git a/src/main/kotlin/club/sakunadaisuki/pcrediveclanrecordbackend/plugins/Mongo.kt b/src/main/kotlin/club/sakunadaisuki/pcrediveclanrecordbackend/plugins/Mongo.kt
index ddf8308..e83702d 100644
--- a/src/main/kotlin/club/sakunadaisuki/pcrediveclanrecordbackend/plugins/Mongo.kt
+++ b/src/main/kotlin/club/sakunadaisuki/pcrediveclanrecordbackend/plugins/Mongo.kt
@@ -132,6 +132,11 @@ fun Application.configureMongo() {
 
             post("/battle_record/create_table_day/{date}") {
                 val date = call.parameters["date"] ?: throw IllegalArgumentException("No date")
+                val exist = battleRecordService.read(date)
+                if (exist.isNotEmpty()) {
+                    call.respond(HttpStatusCode.Conflict)
+                    return@post
+                }
                 battleRecordService.createTable(date).let { battleRecord ->
                     call.respond(HttpStatusCode.OK, battleRecord)
                 }