diff --git a/chrome/browser/extensions/api/management/chrome_management_api_delegate_non_android.cc b/chrome/browser/extensions/api/management/chrome_management_api_delegate_non_android.cc
index 879b267e5318f..74376e4c1ba65 100644
--- a/chrome/browser/extensions/api/management/chrome_management_api_delegate_non_android.cc
+++ b/chrome/browser/extensions/api/management/chrome_management_api_delegate_non_android.cc
@@ -246,15 +246,25 @@ void OnWebAppInstallabilityChecked(
       std::move(callback).Run(InstallOrLaunchWebAppResult::kInvalidWebApp);
       return;
     case InstallableCheckResult::kInstallable:
-      content::WebContents* containing_contents = web_contents.get();
+      base::WeakPtr<content::WebContents> containing_contents =
+          web_contents->GetWeakPtr();
       chrome::ScopedTabbedBrowserDisplayer displayer(profile.get());
       const GURL& url = web_contents->GetLastCommittedURL();
       chrome::AddWebContents(displayer.browser(), nullptr,
                              std::move(web_contents), url,
                              WindowOpenDisposition::NEW_FOREGROUND_TAB,
                              blink::mojom::WindowFeatures());
+      // chrome::AddWebContents() may drop the moved-in WebContents instead of
+      // inserting it into a tab strip (e.g. when PWA Navigation Capturing
+      // returns a focus-existing override with browser=nullptr). Guard against
+      // dereferencing the freed pointer.
+      if (!containing_contents) {
+        std::move(callback).Run(InstallOrLaunchWebAppResult::kUnknownError);
+        return;
+      }
       web_app::CreateWebAppFromManifest(
-          containing_contents, webapps::WebappInstallSource::MANAGEMENT_API,
+          containing_contents.get(),
+          webapps::WebappInstallSource::MANAGEMENT_API,
           base::BindOnce(&OnWebAppInstallCompleted, std::move(callback)));
       return;
   }