Fixed #15168

CHANGELOG-WIP.md

@@ -99,3 +99,4 @@
 - The search keyword index is now updated for owner elements, when a nested element is saved directly which belongs to a searchable custom field. 
 - Updated Yii to 2.0.50. ([#15124](https://github.com/craftcms/cms/issues/15124))
 - Updated inputmask to 5.0.9.
+- Fixed a bug where the `users/login` action wasn’t checking if someone was already logged in. ([#15168](https://github.com/craftcms/cms/issues/15168))

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed an error that occurred when using a multi-environment config. ([#15154](https://github.com/craftcms/cms/issues/15154))
+- Fixed a bug where the `users/login` action wasn’t checking if someone was already logged in. ([#15168](https://github.com/craftcms/cms/issues/15168))
 
 ## 5.2.0-beta.4 - 2024-06-07
 

src/controllers/UsersController.php

@@ -203,7 +203,13 @@ public function beforeAction($action): bool
      */
     public function actionLogin(): ?Response
     {
-        if (!$this->request->getIsPost()) {
+        if ($this->request->getIsGet()) {
+            // see if they're already logged in
+            $user = static::currentUser();
+            if ($user) {
+                return $this->_handleSuccessfulLogin($user);
+            }
+
             return null;
         }