diff --git a/packages/ui/src/components/auth/LoginView.tsx b/packages/ui/src/components/auth/LoginView.tsx
index 7caa742..cead507 100644
--- a/packages/ui/src/components/auth/LoginView.tsx
+++ b/packages/ui/src/components/auth/LoginView.tsx
@@ -150,7 +150,7 @@ const LoginView: Component<LoginViewProps> = (props) => {
 
                     <button
                         type="submit"
-                        disabled={isLoggingIn() || !selectedUserId()}
+                        disabled={isLoggingIn() || !username()}
                         class="w-full flex items-center justify-center gap-3 py-4 bg-gradient-to-r from-blue-600 via-indigo-600 to-purple-600 hover:from-blue-500 hover:to-purple-500 text-white font-bold rounded-2xl shadow-xl shadow-blue-900/20 transform active:scale-[0.98] transition-all disabled:opacity-50 disabled:cursor-not-allowed group"
                     >
                         <Show when={isLoggingIn()} fallback={
diff --git a/packages/ui/src/lib/user-context.ts b/packages/ui/src/lib/user-context.ts
index 1a5bd1f..e6b243f 100644
--- a/packages/ui/src/lib/user-context.ts
+++ b/packages/ui/src/lib/user-context.ts
@@ -107,7 +107,11 @@ export async function initializeUserContext(): Promise<void> {
             const api = (window as any).electronAPI || (window as any).electron
             if (api) {
                 console.log(`[UserContext] Requesting active user from host IPC...`)
-                const activeUser = await (api.invoke ? api.invoke("users:active") : api.ipcRenderer.invoke("users:active"))
+                const invoke = api.invoke || api.ipcRenderer?.invoke || (window as any).ipcRenderer?.invoke
+                if (!invoke) throw new Error("No IPC invoke method found")
+
+                const binder = api.invoke ? api : (api.ipcRenderer || (window as any).ipcRenderer)
+                const activeUser = await invoke.call(binder, "users:active")
 
                 if (activeUser?.id) {
                     console.log(`[UserContext] Host has active session: ${activeUser.id}`)