diff --git a/app/Services/ServiceGoogleSheet.php b/app/Services/ServiceGoogleSheet.php
index fa4a0ed..e14b568 100644
--- a/app/Services/ServiceGoogleSheet.php
+++ b/app/Services/ServiceGoogleSheet.php
@@ -592,7 +592,38 @@ class ServiceGoogleSheet
                 $headers[$colIdx] = $this->normalizeHeader($header);
             }
 
-            // Truncate table and restart identity
+            // Log environment and header diagnostics
+            Log::info('sync_pbg_task_payments: diagnostics', [
+                'spreadsheet_id' => $this->spreadsheetID,
+                'sheet' => $sheetName,
+                'selected_indices_count' => count($selected_indices)
+            ]);
+
+            // Validate that expected headers exist after normalization before truncating table
+            $expectedHeaders = [
+                'no','jenis_konsultasi','no_registrasi','nama_pemilik','lokasi_bg','fungsi_bg','nama_bangunan',
+                'tgl_permohonan','status_verifikasi','status_permohonan','alamat_pemilik','no_hp','email',
+                'tanggal_catatan','catatan_kekurangan_dokumen','gambar','krkkkpr','no_krk','lh','ska','keterangan',
+                'helpdesk','pj','operator_pbg','kepemilikan','potensi_taru','validasi_dinas','kategori_retribusi',
+                'no_urut_ba_tpt_20250001','tanggal_ba_tpt','no_urut_ba_tpa','tanggal_ba_tpa','no_urut_skrd_20250001',
+                'tanggal_skrd','ptsp','selesai_terbit','tanggal_pembayaran_yyyymmdd','format_sts','tahun_terbit',
+                'tahun_berjalan','kelurahan','kecamatan','lb','tb','jlb','unit','usulan_retribusi',
+                'nilai_retribusi_keseluruhan_simbg','nilai_retribusi_keseluruhan_pad','denda','usaha__non_usaha'
+            ];
+
+            $normalizedHeaderValues = array_values($headers);
+            $overlap = array_intersect($expectedHeaders, $normalizedHeaderValues);
+
+            if (count($overlap) < 10) { // too few matching headers, likely wrong sheet or headers changed
+                Log::error('sync_pbg_task_payments: header mismatch detected', [
+                    'expected_sample' => array_slice($expectedHeaders, 0, 15),
+                    'found_sample' => array_slice($normalizedHeaderValues, 0, 30),
+                    'match_count' => count($overlap)
+                ]);
+                return ['success' => false, 'message' => 'Header mismatch - aborting to prevent null inserts'];
+            }
+
+            // Truncate table and restart identity (only after header validation)
             Schema::disableForeignKeyConstraints();
             DB::table('pbg_task_payments')->truncate();
             Schema::enableForeignKeyConstraints();
@@ -694,7 +725,7 @@ class ServiceGoogleSheet
 
                 // Build and insert this chunk
                 $batch = [];
-                foreach ($values as $row) {
+                foreach ($values as $rowIndex => $row) {
                     $record = [
                         'created_at' => now(),
                         'updated_at' => now(),
@@ -709,6 +740,17 @@ class ServiceGoogleSheet
                         if ($rowByHeader[$h] === '') $rowByHeader[$h] = null;
                     }
 
+                    // Log first non-empty row mapping for diagnostics
+                    if ($rowIndex === 0) {
+                        $nonEmptySample = [];
+                        foreach ($rowByHeader as $k => $v) {
+                            if ($v !== null && count($nonEmptySample) < 10) { $nonEmptySample[$k] = $v; }
+                        }
+                        Log::info('sync_pbg_task_payments: first row sample after normalization', [
+                            'sample' => $nonEmptySample
+                        ]);
+                    }
+
                     // Skip if this row looks like a header row
                     $headerCheckKeys = ['no','jenis_konsultasi','no_registrasi'];
                     $headerMatches = 0;