diff --git a/app/stage/auth.html b/app/stage/auth.html
index ab1e5fb95..1b857171d 100644
--- a/app/stage/auth.html
+++ b/app/stage/auth.html
@@ -460,13 +460,31 @@
         }
     }
 
+    const showMessage = (msg)=> {
+        document.querySelector('#message').classList.add('b3-snackbar--show')
+        document.querySelector('#message').firstElementChild.innerHTML = msg
+        setTimeout(() => {
+            document.querySelector('#message').classList.remove('b3-snackbar--show')
+            document.querySelector('#message').firstElementChild.textContent = ''
+        }, 6000)
+    }
+
     const submitAuth = () => {
         const inputElement = document.getElementById('authCode')
         const captchaElement = document.getElementById('captcha')
+        let code =  inputElement.value.trim();
+        if ("" === code) {
+            showMessage({{.l9}})
+            inputElement.value = ''
+            captchaElement.value = ''
+            inputElement.focus()
+            return
+        }
+
         fetch('/api/system/loginAuth', {
             method: 'POST',
             body: JSON.stringify({
-                authCode: inputElement.value,
+                authCode: code,
                 captcha: captchaElement.value,
             }),
         }).then((response) => {
@@ -486,15 +504,10 @@
                 captchaElement.previousElementSibling.src = ''
             }
 
-            document.querySelector('#message').classList.add('b3-snackbar--show')
-            document.querySelector('#message').firstElementChild.textContent = response.msg
+            showMessage(response.msg)
             inputElement.value = ''
             captchaElement.value = ''
             inputElement.focus()
-            setTimeout(() => {
-                document.querySelector('#message').classList.remove('b3-snackbar--show')
-                document.querySelector('#message').firstElementChild.textContent = ''
-            }, 6000)
         })
     }
 
diff --git a/kernel/server/serve.go b/kernel/server/serve.go
index fae52d3c1..2df02a117 100644
--- a/kernel/server/serve.go
+++ b/kernel/server/serve.go
@@ -451,6 +451,7 @@ func serveAuthPage(c *gin.Context) {
 		"l6":                     model.Conf.Language(178),
 		"l7":                     template.HTML(model.Conf.Language(184)),
 		"l8":                     model.Conf.Language(95),
+		"l9":                     model.Conf.Language(83),
 		"appearanceMode":         model.Conf.Appearance.Mode,
 		"appearanceModeOS":       model.Conf.Appearance.ModeOS,
 		"workspace":              util.WorkspaceName,