diff --git a/ui/src/components/Layout.tsx b/ui/src/components/Layout.tsx
index 28773668..c918dcb5 100644
--- a/ui/src/components/Layout.tsx
+++ b/ui/src/components/Layout.tsx
@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { BookOpen, MessageSquare, Moon, Settings, Sun } from "lucide-react";
-import { Link, Outlet, useLocation, useNavigate, useParams } from "@/lib/router";
+import { Link, Navigate, Outlet, useLocation, useNavigate, useParams } from "@/lib/router";
 import { CompanyRail } from "./CompanyRail";
 import { Sidebar } from "./Sidebar";
 import { InstanceSidebar } from "./InstanceSidebar";
@@ -460,10 +460,31 @@ export function Layout() {
               )}
             >
               {hasUnknownCompanyPrefix ? (
-                <NotFoundPage
-                  scope="invalid_company_prefix"
-                  requestedPrefix={companyPrefix ?? selectedCompany?.issuePrefix}
-                />
+                // [nexus] Auto-recover from bogus URL prefixes by redirecting
+                // to the same path under the first available company, instead
+                // of leaving the user stranded on an "Invite not available"
+                // style dead end with no way back. hasUnknownCompanyPrefix is
+                // already gated on companies.length > 0, so the fallback is
+                // guaranteed to resolve. If no fallback exists for some reason,
+                // fall through to the old NotFoundPage.
+                (() => {
+                  const fallbackCompany = selectedCompany ?? companies[0] ?? null;
+                  if (!fallbackCompany) {
+                    return (
+                      <NotFoundPage
+                        scope="invalid_company_prefix"
+                        requestedPrefix={companyPrefix ?? undefined}
+                      />
+                    );
+                  }
+                  const restOfPath = location.pathname.replace(/^\/[^/]+/, "") || "/dashboard";
+                  return (
+                    <Navigate
+                      to={`/${fallbackCompany.issuePrefix}${restOfPath}${location.search}${location.hash}`}
+                      replace
+                    />
+                  );
+                })()
               ) : (
                 <Outlet />
               )}