diff --git a/backend/internal/mildware/auth.go b/backend/internal/mildware/auth.go
index 550da71..b10a7d3 100755
--- a/backend/internal/mildware/auth.go
+++ b/backend/internal/mildware/auth.go
@@ -2,6 +2,7 @@ package mildware
 
 import (
 	"net/http"
+	"strconv"
 	"strings"
 
 	"gen2d/internal/logger"
@@ -45,7 +46,23 @@ func AuthMiddleware(jwtSecret string) gin.HandlerFunc {
 		}
 
 		if sub, ok := claims["sub"]; ok {
-			c.Set("userID", sub)
+			var userID uint
+			switch v := sub.(type) {
+			case float64:
+				userID = uint(v)
+			case int:
+				userID = uint(v)
+			case int64:
+				userID = uint(v)
+			case uint:
+				userID = v
+			case string:
+				num, err := strconv.ParseUint(v, 10, 64)
+				if err == nil {
+					userID = uint(num)
+				}
+			}
+			c.Set("userID", userID)
 		}
 
 		c.Next()