diff --git a/backend/routes/user.go b/backend/routes/user.go
index 0be8a5b9..56a8cb2c 100644
--- a/backend/routes/user.go
+++ b/backend/routes/user.go
@@ -98,6 +98,11 @@ func PutUser(c *gin.Context) {
 	// UserId
 	uid := services.GetCurrentUserId(c)
 
+	// 空 UserId 处理
+	if uid == "" {
+		uid = bson.ObjectIdHex(constants.ObjectIdNull)
+	}
+
 	// 添加用户
 	if err := services.CreateNewUser(reqData.Username, reqData.Password, reqData.Role, reqData.Email, uid); err != nil {
 		HandleError(http.StatusInternalServerError, c, err)
diff --git a/backend/services/user.go b/backend/services/user.go
index adc56136..fbad2c71 100644
--- a/backend/services/user.go
+++ b/backend/services/user.go
@@ -114,6 +114,9 @@ func CreateNewUser(username string, password string, role string, email string,
 
 func GetCurrentUser(c *gin.Context) *model.User {
 	data, _ := c.Get(constants.ContextUser)
+	if data == nil {
+		return &model.User{}
+	}
 	return data.(*model.User)
 }