diff --git a/app/Services/ThemeService.php b/app/Services/ThemeService.php
index d72eb66..4218c49 100644
--- a/app/Services/ThemeService.php
+++ b/app/Services/ThemeService.php
@@ -191,8 +191,12 @@ class ThemeService
     /**
      * 切换主题
      */
-    public function switch(string $theme): bool
+    public function switch(string|null $theme): bool
     {
+        if ($theme === null) {
+            return true;
+        }
+
         $currentTheme = admin_setting('current_theme');
 
         try {