diff --git a/backend/controller/hamaController.js b/backend/controller/hamaController.js
index 28f04fc..a2d4653 100644
--- a/backend/controller/hamaController.js
+++ b/backend/controller/hamaController.js
@@ -52,30 +52,36 @@ exports.getHamaById = async (req, res) => {
 exports.createHama = async (req, res) => {
   try {
     const { nama, deskripsi, penanganan, nilai_pakar } = req.body;
-    const file = req.file; 
+    const file = req.file;
 
-    // Cek kode terakhir
+    // Generate kode otomatis
     const lastHama = await Hama.findOne({ order: [['id', 'DESC']] });
-    let newKode = 'H01'; // Default kode awal
+    let newKode = 'H01';
     if (lastHama) {
       const lastNumber = parseInt(lastHama.kode.substring(1)) + 1;
       newKode = `H${lastNumber.toString().padStart(2, '0')}`;
     }
 
-    // Cek kalau ada file yang diupload
+    // Tangani upload file
     let fotoPath = '';
     if (file) {
-      fotoPath = file.filename; 
+      fotoPath = file.filename;
+    }
+
+    // Konversi nilai_pakar agar null jika kosong
+    let nilaiPakar = null;
+    if (nilai_pakar !== undefined && nilai_pakar !== '') {
+      nilaiPakar = parseFloat(nilai_pakar);
     }
 
     const newHama = await Hama.create({
       kode: newKode,
       nama,
-      kategori: 'hama', 
+      kategori: 'hama',
       deskripsi,
       penanganan,
-      foto: fotoPath, 
-      nilai_pakar
+      foto: fotoPath,
+      nilai_pakar: nilaiPakar
     });
 
     res.status(201).json({ message: 'Hama berhasil ditambahkan', data: newHama });
@@ -85,6 +91,7 @@ exports.createHama = async (req, res) => {
 };
 
 
+
 // 🔹 Fungsi untuk mengupdate hama berdasarkan ID
 exports.updateHama = async (req, res) => {
   try {
diff --git a/frontend/lib/admin/tambah_hama_page.dart b/frontend/lib/admin/tambah_hama_page.dart
index e548771..342a165 100644
--- a/frontend/lib/admin/tambah_hama_page.dart
+++ b/frontend/lib/admin/tambah_hama_page.dart
@@ -38,31 +38,36 @@ class _TambahHamaPageState extends State<TambahHamaPage> {
   }
 
   Future<void> _simpanHama() async {
-    if (namaController.text.isNotEmpty &&
-        deskripsiController.text.isNotEmpty &&
-        penangananController.text.isNotEmpty &&
-        nilaiPakarController.text.isNotEmpty) {
-      try {
+  if (namaController.text.isNotEmpty &&
+      deskripsiController.text.isNotEmpty &&
+      penangananController.text.isNotEmpty) {
+    try {
+      double? nilaipakar;
+      if (nilaiPakarController.text.isNotEmpty) {
         String nilaiInput = nilaiPakarController.text.replaceAll(',', '.');
-        double nilaiPakar = double.parse(nilaiInput);
-        await apiService.createHama(
-          namaController.text,
-          deskripsiController.text,
-          penangananController.text,
-          _pickedFile,
-          nilaiPakar,         
-        );
-        widget.onHamaAdded();
-        Navigator.pop(context);
-        _showDialog('Berhasil', 'Data hama berhasil ditambahkan.');
-      } catch (e) {
-        _showDialog('Gagal', 'Gagal menambahkan data hama.');
-        print("Error adding hama: $e");
+        nilaipakar = double.parse(nilaiInput);
       }
-    } else {
-      _showDialog('Error', 'Semua field harus diisi.');
+
+      await apiService.createHama(
+        namaController.text,
+        deskripsiController.text,
+        penangananController.text,
+        _pickedFile,
+        nilaipakar, // boleh null
+      );
+
+      widget.onHamaAdded();
+      Navigator.pop(context);
+      _showDialog('Berhasil', 'Data hama berhasil ditambahkan.');
+    } catch (e) {
+      _showDialog('Gagal', 'Gagal menambahkan data hama.');
+      print("Error adding hama: $e");
     }
+  } else {
+    _showDialog('Error', 'Semua field harus diisi (kecuali nilai pakar).');
   }
+}
+
 
   void _showDialog(String title, String message) {
     showDialog(
@@ -142,11 +147,11 @@ class _TambahHamaPageState extends State<TambahHamaPage> {
                           maxLines: 3,
                         ),
                         SizedBox(height: 15),
-                        TextField(
-                          controller: nilaiPakarController,
-                          decoration: InputDecoration(labelText: 'Nilai Pakar'),
-                          maxLines: 3,
-                        ),
+                        // TextField(
+                        //   controller: nilaiPakarController,
+                        //   decoration: InputDecoration(labelText: 'Nilai Pakar'),
+                        //   maxLines: 3,
+                        // ),
                         SizedBox(height: 15),
                         Text('Foto'),
                     (_webImage != null)
diff --git a/frontend/lib/api_services/api_services.dart b/frontend/lib/api_services/api_services.dart
index 5cafd23..01fcf31 100644
--- a/frontend/lib/api_services/api_services.dart
+++ b/frontend/lib/api_services/api_services.dart
@@ -596,7 +596,7 @@ Future<List<Map<String, dynamic>>> getAllHistori() async {
     String deskripsi,
     String penanganan,
     XFile? pickedFile,
-    double nilai_pakar
+    double? nilai_pakar
   ) async {
     try {
       var uri = Uri.parse(hamaUrl);
diff --git a/frontend/lib/user/diagnosa_page.dart b/frontend/lib/user/diagnosa_page.dart
index 645bbf8..b0efd85 100644
--- a/frontend/lib/user/diagnosa_page.dart
+++ b/frontend/lib/user/diagnosa_page.dart
@@ -57,10 +57,10 @@ class _DiagnosaPageState extends State<DiagnosaPage> {
 
   void prosesHasilDiagnosa() async {
     // Validasi minimal 3 gejala
-    if (gejalaTerpilihIds.length < 3) {
+    if (gejalaTerpilihIds.length < 2) {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
-          content: Text('Silakan pilih minimal 3 gejala untuk melakukan diagnosa'),
+          content: Text('Silakan pilih minimal 2 gejala untuk melakukan diagnosa'),
           backgroundColor: Color(0xFF9DC08D),
           duration: Duration(seconds: 3),
         ),
@@ -194,7 +194,7 @@ class _DiagnosaPageState extends State<DiagnosaPage> {
                                       borderRadius: BorderRadius.circular(12),
                                     ),
                                     child: Text(
-                                      "${gejalaTerpilihIds.length}/min 3",
+                                      "${gejalaTerpilihIds.length}/min 2",
                                       style: TextStyle(
                                         color: Colors.white,
                                         fontSize: 12,
@@ -227,16 +227,16 @@ class _DiagnosaPageState extends State<DiagnosaPage> {
                                 height: 30,
                                 child: ElevatedButton(
                                   style: ElevatedButton.styleFrom(
-                                    backgroundColor: gejalaTerpilihIds.length >= 3 ? Colors.green : Colors.grey,
+                                    backgroundColor: gejalaTerpilihIds.length >= 2 ? Colors.green : Colors.grey,
                                     shape: RoundedRectangleBorder(
                                       borderRadius: BorderRadius.circular(15),
                                     ),
                                   ),
-                                  onPressed: gejalaTerpilihIds.length >= 3 ? prosesHasilDiagnosa : null,
+                                  onPressed: gejalaTerpilihIds.length >= 2 ? prosesHasilDiagnosa : null,
                                   child: Text(
-                                    gejalaTerpilihIds.length >= 3 
+                                    gejalaTerpilihIds.length >= 2 
                                         ? "Lihat Hasil Diagnosa" 
-                                        : "Pilih minimal 3 gejala",
+                                        : "Pilih minimal 2 gejala",
                                     style: TextStyle(
                                       color: Colors.white, 
                                       fontSize: 16, 
diff --git a/frontend/lib/user/hasil_diagnosa_page.dart b/frontend/lib/user/hasil_diagnosa_page.dart
index d798df4..ba36ae2 100644
--- a/frontend/lib/user/hasil_diagnosa_page.dart
+++ b/frontend/lib/user/hasil_diagnosa_page.dart
@@ -913,7 +913,7 @@ class _HasilDiagnosaPageState extends State<HasilDiagnosaPage> {
           ),
           child: Center(
             child: Text(
-              '${(probabilitas * 100).toStringAsFixed(0)}%',
+              '${(probabilitas * 100).toStringAsFixed(1)}%',
               style: TextStyle(
                 color: Colors.white,
                 fontWeight: FontWeight.bold,
diff --git a/frontend/lib/user/home_page.dart b/frontend/lib/user/home_page.dart
index e952886..f53e202 100644
--- a/frontend/lib/user/home_page.dart
+++ b/frontend/lib/user/home_page.dart
@@ -29,7 +29,7 @@ class _HomePageState extends State<HomePage> {
   void _startAutoLogoutTimer() {
     _logoutTimer?.cancel(); // Pastikan timer sebelumnya di-cancel
 
-    _logoutTimer = Timer(const Duration(minutes: 5), () async {
+    _logoutTimer = Timer(const Duration(hours: 12), () async {
       // Hapus semua data login
       final prefs = await SharedPreferences.getInstance();
       await prefs.clear();