diff --git a/modules/candidate_parameters/ajax/getData.php b/modules/candidate_parameters/ajax/getData.php
index 65dead0bc0..0269d6e4bc 100644
--- a/modules/candidate_parameters/ajax/getData.php
+++ b/modules/candidate_parameters/ajax/getData.php
@@ -563,8 +563,7 @@ function getDOBFields(): array
     $dobFormat = $config->getSetting('dobFormat');
 
     $dobProcessedFormat = implode("-", str_split($dobFormat, 1));
-    $dobDate            = DateTime::createFromFormat('Y-m-d', $dob);
-    $formattedDate      = $dobDate ? $dobDate->format($dobProcessedFormat) : null;
+    $formattedDate      = formatCandidateDate($dob, $dobProcessedFormat);
 
     $result = [
         'pscid'     => $pscid,
@@ -610,9 +609,10 @@ function getDODFields(): array
     $dobFormat = $config->getSetting('dobFormat');
 
     $dobProcessedFormat = implode("-", str_split($dobFormat, 1));
-    $dobDate            = DateTime::createFromFormat('Y-m-d', $candidateData['DoB']);
-    $dob = $dobDate ? $dobDate->format($dobProcessedFormat) : null;
-
+    $dob    = formatCandidateDate(
+        $candidateData['DoB'] ?? null,
+        $dobProcessedFormat
+    );
     $result = [
         'pscid'     => $candidateData['PSCID'],
         'candID'    => $candID->__toString(),
@@ -704,3 +704,28 @@ function getDiagnosisEvolutionFields(): array
     return $result;
 }
 
+/**
+ * Format a candidate date for display.
+ *
+ * Returns null when the date is null or invalid.
+ *
+ * @param string|null $date   Database date in Y-m-d format
+ * @param string      $format Display format
+ *
+ * @return string|null
+ */
+function formatCandidateDate(?string $date, string $format): ?string
+{
+    if (empty($date)) {
+        return null;
+    }
+
+    $dateTime = DateTime::createFromFormat('Y-m-d', $date);
+
+    if ($dateTime === false) {
+        return null;
+    }
+
+    return $dateTime->format($format);
+}
+