diff --git a/README.md b/README.md
index b77a4df..4a7d12e 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Create file `theme.conf.user` in theme folder. See `slice/theme.conf` for refere
 
 ### Debug mode options
 
-Since "Power" screen can't be viewed in greeter because it depends on `sddm.*` properties, there is a debug mode.
+There are some things that can't be tested well in greeter (e.g. shutdown options or login error). So there is a debug mode.
 
 #### Boolean options
 
@@ -37,6 +37,12 @@ Since "Power" screen can't be viewed in greeter because it depends on `sddm.*` p
 * `debug_can_suspend` - sets `sddm.canSuspend` (shows "Suspend").
 * `debug_can_hibernate` - sets `sddm.canHibernate` (shows "Hibernate").
 * `debug_can_hybrid_sleep` - sets `sddm.canHybridSleep` (shows "Hybrid Sleep").
+* `debug_login_error` - forces login error.
+
+
+#### Number options
+
+* `debug_login_timeout` - time between pressing "Login" and login error in seconds. Not effective if `debug_login_error` is disabled.
 
 #### String options
 
diff --git a/slice/Debug.qml b/slice/Debug.qml
index 4344a33..f6d28df 100644
--- a/slice/Debug.qml
+++ b/slice/Debug.qml
@@ -31,7 +31,8 @@ Item
     readonly property bool canSuspend: debugbool(config.debug_can_suspend, sddm.canSuspend)
     readonly property bool canHibernate: debugbool(config.debug_can_hibernate, sddm.canHibernate)
     readonly property bool canHybridSleep: debugbool(config.debug_can_hybrid_sleep, sddm.canHybridSleep)
-
+    readonly property bool loginError: debugbool(config.debug_login_error, false)
+    readonly property int loginTimeout: debugnum(config.debug_login_timeout, 0)
     readonly property string hostName: debugstr(config.debug_hostname, sddm.hostName)
 
 }
\ No newline at end of file
diff --git a/slice/PageUsers.qml b/slice/PageUsers.qml
index 2e42d4d..2e3b007 100644
--- a/slice/PageUsers.qml
+++ b/slice/PageUsers.qml
@@ -642,7 +642,10 @@ Item
             pageRoot.enabled = false
             progressBarLoop.start()
             loginEnterAnimation.start()
-            sddm.login(currentUserLogin, passwordField.text, selectedSessionIndex)
+            if (debug.loginError)
+                loginTimeoutTimer.start()
+            else
+                sddm.login(currentUserLogin, passwordField.text, selectedSessionIndex)
         }
         else
         {
@@ -670,6 +673,13 @@ Item
         }
     }
 
+    Timer
+    {
+        id: loginTimeoutTimer
+        interval: debug.loginTimeout * 1000
+        onTriggered: sddm.onLoginFailed()
+    }
+
     Keys.onUpPressed: scroll_down()
     Keys.onDownPressed: scroll_up()
     Keys.onEnterPressed: select_or_login()