diff --git a/components/com_tags/src/Service/Router.php b/components/com_tags/src/Service/Router.php
index e96b23363f43e..9c2118117bf7d 100644
--- a/components/com_tags/src/Service/Router.php
+++ b/components/com_tags/src/Service/Router.php
@@ -76,7 +76,12 @@ public function __construct(SiteApplication $app, AbstractMenu $menu, ?CategoryF
         parent::__construct($app, $menu);
 
         $sefPlugin       = PluginHelper::getPlugin('system', 'sef');
-        $this->sefparams = new Registry($sefPlugin->params);
+
+        if ($sefPlugin) {
+            $this->sefparams = new Registry($sefPlugin->params);
+        } else {
+            $this->sefparams = new Registry();
+        }
 
         $this->buildLookup();
     }
diff --git a/libraries/src/Component/Router/Rules/MenuRules.php b/libraries/src/Component/Router/Rules/MenuRules.php
index 9fc82938f5e61..4deac6ec64a1a 100644
--- a/libraries/src/Component/Router/Rules/MenuRules.php
+++ b/libraries/src/Component/Router/Rules/MenuRules.php
@@ -63,7 +63,12 @@ public function __construct(RouterView $router)
     {
         $this->router    = $router;
         $sefPlugin       = PluginHelper::getPlugin('system', 'sef');
-        $this->sefparams = new Registry($sefPlugin->params);
+
+        if ($sefPlugin) {
+            $this->sefparams = new Registry($sefPlugin->params);
+        } else {
+            $this->sefparams = new Registry();
+        }
 
         $this->buildLookup();
     }