diff --git a/core/backend/src/main/resources/db/migration/V18__add_demo.sql b/core/backend/src/main/resources/db/migration/V18__add_demo.sql
index 6419a2cfba..b7f13fd14b 100644
--- a/core/backend/src/main/resources/db/migration/V18__add_demo.sql
+++ b/core/backend/src/main/resources/db/migration/V18__add_demo.sql
@@ -228,7 +228,7 @@ SET FOREIGN_KEY_CHECKS = 0;
 -- ----------------------------
 -- Table structure for demo_new_trend_of_diagnosis
 -- ----------------------------
-CREATE TABLE `demo_new_trend_of_diagnosis` (
+CREATE TABLE IF NOT EXISTS `demo_new_trend_of_diagnosis` (
    `date` varchar(50) NOT NULL DEFAULT '' COMMENT '日期',
    `new_diagnosis` bigint(13) DEFAULT NULL COMMENT '新增确诊',
    `current_diagnosis` bigint(13) DEFAULT NULL COMMENT '现有确诊'