diff --git a/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.cc b/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.cc
index 97b80bbc39f42..e30bebda1c836 100644
--- a/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.cc
+++ b/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.cc
@@ -346,10 +346,22 @@ void DigitalIdentityMultiStepDialog::TryShow(
                    std::move(custom_body_field));
 
   if (new_dialog_delegate) {
+    // ShowWebModalDialogViews → BlockWebContentsInteraction(true) →
+    // ExitFullscreen / widget activation can re-enter and synchronously destroy
+    // the hosting WebContents / RenderFrameHost, which tears down the owning
+    // DigitalIdentityProviderDesktop and therefore `this`. Guard with a
+    // WeakPtr.
+    base::WeakPtr<DigitalIdentityMultiStepDialog> weak_this =
+        weak_ptr_factory_.GetWeakPtr();
     // views::Widget takes ownership of `new_dialog_delegate`.
-    dialog_ = constrained_window::ShowWebModalDialogViews(
-                  new_dialog_delegate.release(), web_contents_.get())
-                  ->GetWeakPtr();
+    base::WeakPtr<views::Widget> widget =
+        constrained_window::ShowWebModalDialogViews(
+            new_dialog_delegate.release(), web_contents_.get())
+            ->GetWeakPtr();
+    if (!weak_this) {
+      return;
+    }
+    dialog_ = std::move(widget);
     extensions::SecurityDialogTracker::GetInstance()->AddSecurityDialog(
         dialog_.get());
   }
diff --git a/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.h b/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.h
index 2b355e6a3e8ae..d94980bcff1eb 100644
--- a/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.h
+++ b/chrome/browser/ui/views/digital_credentials/digital_identity_multi_step_dialog.h
@@ -85,6 +85,8 @@ class DigitalIdentityMultiStepDialog {
   base::WeakPtr<content::WebContents> web_contents_;
 
   base::WeakPtr<views::Widget> dialog_;
+
+  base::WeakPtrFactory<DigitalIdentityMultiStepDialog> weak_ptr_factory_{this};
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DIGITAL_CREDENTIALS_DIGITAL_IDENTITY_MULTI_STEP_DIALOG_H_