diff --git a/server/handler/handler_admin.go b/server/handler/handler_admin.go
index fa801dd..16397ad 100644
--- a/server/handler/handler_admin.go
+++ b/server/handler/handler_admin.go
@@ -244,9 +244,7 @@ func (c *Controller) ServeCreateUserDo(w http.ResponseWriter, r *http.Request) {
 	}
 	err = c.DB.Create(&user).Error
 	if err != nil {
-		sessAddFlashW(fmt.Sprintf(
-			"could not create user `%s`: %v", username, err,
-		), session)
+		sessAddFlashWf("could not create user `%s`: %v", session, username, err)
 		sessLogSave(w, r, session)
 		http.Redirect(w, r, r.Header.Get("Referer"), http.StatusSeeOther)
 		return
diff --git a/server/handler/handler_admin_utils.go b/server/handler/handler_admin_utils.go
index 9741883..3ef3380 100644
--- a/server/handler/handler_admin_utils.go
+++ b/server/handler/handler_admin_utils.go
@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"fmt"
 	"log"
 	"net/http"
 
@@ -34,9 +35,17 @@ func sessAddFlashW(message string, s *sessions.Session) {
 	})
 }
 
+func sessAddFlashWf(message string, s *sessions.Session, a ...interface{}) {
+	sessAddFlashW(fmt.Sprintf(message, a...), s)
+}
+
 func sessAddFlashN(message string, s *sessions.Session) {
 	s.AddFlash(Flash{
 		Message: message,
 		Type:    "normal",
 	})
 }
+
+func sessAddFlashNf(message string, s *sessions.Session, a ...interface{}) {
+	sessAddFlashN(fmt.Sprintf(message, a...), s)
+}