diff --git a/htdocs/app/Services/AstmMessageService.php b/htdocs/app/Services/AstmMessageService.php
index 825dac1f..b2f545fb 100644
--- a/htdocs/app/Services/AstmMessageService.php
+++ b/htdocs/app/Services/AstmMessageService.php
@@ -474,6 +474,16 @@ class AstmMessageService
                 if (isset($headerData[3])){
                     $accnumber                  = $headerData[47] ?? null;
                     $noregister                 = $headerData[16] ?? null;
+                    if (empty($accnumber)) {
+                        Log::warning('ASTM BD message skipped because accession number is missing.', [
+                            'header' => $headerData,
+                        ]);
+                        return false;
+                    }
+
+                    $resultSample = ResultSample::firstOrNew([
+                        'accession_number' => $accnumber,
+                    ]);
                     $nama                       = $headerData[18] ?? null;
                     $urgensi                    = $headerData[50] ?? null; //A Critical R Normal
                     $iddokter                   = $headerData[33] ?? null;