diff --git a/chrome/browser/ui/webui/history_clusters/history_clusters_handler.cc b/chrome/browser/ui/webui/history_clusters/history_clusters_handler.cc
index 961b2d701aafb3..7d317186b1ff7b 100644
--- a/chrome/browser/ui/webui/history_clusters/history_clusters_handler.cc
+++ b/chrome/browser/ui/webui/history_clusters/history_clusters_handler.cc
@@ -73,11 +73,12 @@ void InvokeAction(actions::ActionId id, actions::ActionItem* scope) {
 // Returns the current browser window, regardless of whether this instance is
 // tab-scoped or window-scoped.
 BrowserWindowInterface* GetBrowserWindowInterface(
-    std::variant<BrowserWindowInterface*, tabs::TabInterface*> interface) {
-  if (std::holds_alternative<BrowserWindowInterface*>(interface)) {
-    return std::get<BrowserWindowInterface*>(interface);
+    const HistoryClustersHandler::ContextInterface& interface) {
+  if (std::holds_alternative<raw_ptr<BrowserWindowInterface>>(interface)) {
+    return std::get<raw_ptr<BrowserWindowInterface>>(interface);
   }
-  return std::get<tabs::TabInterface*>(interface)->GetBrowserWindowInterface();
+  return std::get<raw_ptr<tabs::TabInterface>>(interface)
+      ->GetBrowserWindowInterface();
 }
 
 class HistoryClustersSidePanelContextMenu
@@ -85,7 +86,7 @@ class HistoryClustersSidePanelContextMenu
       public ui::SimpleMenuModel::Delegate {
  public:
   HistoryClustersSidePanelContextMenu(
-      std::variant<BrowserWindowInterface*, tabs::TabInterface*> interface,
+      HistoryClustersHandler::ContextInterface interface,
       GURL url)
       : ui::SimpleMenuModel(this), interface_(interface), url_(std::move(url)) {
     AddItemWithStringId(IDC_CONTENT_CONTEXT_OPENLINKNEWTAB,
@@ -100,7 +101,7 @@ class HistoryClustersSidePanelContextMenu
                         IDS_HISTORY_CLUSTERS_COPY_LINK);
   }
   HistoryClustersSidePanelContextMenu(
-      std::variant<BrowserWindowInterface*, tabs::TabInterface*> interface,
+      HistoryClustersHandler::ContextInterface interface,
       std::string query)
       : ui::SimpleMenuModel(this), interface_(interface), query_(query) {
     AddItemWithStringId(IDC_CUT, IDS_HISTORY_CLUSTERS_CUT);
@@ -177,7 +178,7 @@ class HistoryClustersSidePanelContextMenu
  private:
   // Exactly one of `browser_window_interface_` and `tab_interface_` will be
   // non-nullptr.
-  std::variant<BrowserWindowInterface*, tabs::TabInterface*> interface_;
+  HistoryClustersHandler::ContextInterface interface_;
   std::string query_;
   GURL url_;
 };
diff --git a/chrome/browser/ui/webui/history_clusters/history_clusters_handler.h b/chrome/browser/ui/webui/history_clusters/history_clusters_handler.h
index 82a1eaddc83fe9..de481960e36c33 100644
--- a/chrome/browser/ui/webui/history_clusters/history_clusters_handler.h
+++ b/chrome/browser/ui/webui/history_clusters/history_clusters_handler.h
@@ -90,8 +90,12 @@ class HistoryClustersHandler : public mojom::PageHandler,
   void SetSidePanelUIEmbedder(
       base::WeakPtr<TopChromeWebUIController::Embedder> side_panel_embedder);
 
+  // Use raw_ptr<T> inside the variant so that MiraclePtr (BackupRefPtr)
+  // protects the cached pointers. The TabInterface can be destroyed while this
+  // handler is still alive (e.g. when a popup hosting chrome://history is
+  // converted to a tab via ConvertPopupToTabbedBrowser).
   using ContextInterface =
-      std::variant<BrowserWindowInterface*, tabs::TabInterface*>;
+      std::variant<raw_ptr<BrowserWindowInterface>, raw_ptr<tabs::TabInterface>>;
   void SetContextInterface(ContextInterface interface);
 
   // Used to set the in-page query from the browser.