diff --git a/app/Repositories/ExamRepository.php b/app/Repositories/ExamRepository.php
index 0fc5c2707..e7d992853 100644
--- a/app/Repositories/ExamRepository.php
+++ b/app/Repositories/ExamRepository.php
@@ -251,21 +251,21 @@ private function isExamMatchUser(Exam $exam, $user): bool
         $filters = $exam->filters;
 
         $filter = Exam::FILTER_USER_CLASS;
-        $filterValues = $filters[$filter];
+        $filterValues = $filters[$filter] ?? [];
         if (!empty($filterValues) && !in_array($user->class, $filterValues)) {
             do_log("$logPrefix, user class: {$user->class} not in: " . json_encode($filterValues));
             return false;
         }
 
         $filter = Exam::FILTER_USER_DONATE;
-        $filterValues = $filters[$filter];
+        $filterValues = $filters[$filter] ?? [];
         if (!empty($filterValues) && !in_array($user->donate_status, $filterValues)) {
             do_log("$logPrefix, user donate status: {$user->donate_status} not in: " . json_encode($filterValues));
             return false;
         }
 
         $filter = Exam::FILTER_USER_REGISTER_TIME_RANGE;
-        $filterValues = $filters[$filter];
+        $filterValues = $filters[$filter] ?? [];
         $added = $user->added->toDateTimeString();
         $registerTimeBegin = isset($filterValues[0]) ? Carbon::parse($filterValues[0])->toDateTimeString() : '';
         $registerTimeEnd = isset($filterValues[1]) ? Carbon::parse($filterValues[1])->toDateTimeString() : '';
@@ -868,7 +868,7 @@ public function fetchUserAndDoAssign(Exam $exam): bool|int
         }
 
         $filter = Exam::FILTER_USER_REGISTER_TIME_RANGE;
-        $range = $filters[$filter];
+        $range = $filters[$filter] ?? [];
         if (!empty($range)) {
             if (!empty($range[0])) {
                 $baseQuery->where("$userTable.added", ">=", Carbon::parse($range[0])->toDateTimeString());
diff --git a/include/constants.php b/include/constants.php
index 037e63af7..c7518e025 100644
--- a/include/constants.php
+++ b/include/constants.php
@@ -1,6 +1,6 @@
 <?php
-defined('VERSION_NUMBER') || define('VERSION_NUMBER', '1.7.37');
-defined('RELEASE_DATE') || define('RELEASE_DATE', '2023-05-08');
+defined('VERSION_NUMBER') || define('VERSION_NUMBER', '1.7.38');
+defined('RELEASE_DATE') || define('RELEASE_DATE', '2023-05-14');
 defined('IN_TRACKER') || define('IN_TRACKER', false);
 defined('PROJECTNAME') || define("PROJECTNAME","NexusPHP");
 defined('NEXUSPHPURL') || define("NEXUSPHPURL","https://nexusphp.org");