diff --git a/scripts/send_email.php b/scripts/send_email.php
index f32ad622..b037f290 100755
--- a/scripts/send_email.php
+++ b/scripts/send_email.php
@@ -292,6 +292,11 @@ foreach ($rows as $row) {
             continue;
         }
 
+        if (substr($pdf, 0, 4) !== '%PDF') {
+            log_msg("  Not a PDF (got HTML/error response), skipping");
+            continue;
+        }
+
         $tmp = tempnam(sys_get_temp_dir(), 'ibl_email_') . '.pdf';
         file_put_contents($tmp, $pdf);
         $tmp_files[] = $tmp;
diff --git a/sql/manual_changes/2026-05-24-add-nat-subsubgroup-sequence-column.sql b/sql/manual_changes/2026-05-24-add-nat-subsubgroup-sequence-column.sql
new file mode 100644
index 00000000..3a1fa77a
--- /dev/null
+++ b/sql/manual_changes/2026-05-24-add-nat-subsubgroup-sequence-column.sql
@@ -0,0 +1,5 @@
+-- Add missing Nat_SubSubGroupSequence column to nat_subsubgroup
+-- Required by sp_rpt_hasil_lab which references this column in SELECT and ORDER BY
+
+ALTER TABLE nat_subsubgroup
+  ADD COLUMN Nat_SubSubGroupSequence char(2) NOT NULL DEFAULT '' AFTER Nat_SubSubGroupCode;