diff --git a/app/Repositories/ExamRepository.php b/app/Repositories/ExamRepository.php
index 23bbfcf7..f5544da5 100644
--- a/app/Repositories/ExamRepository.php
+++ b/app/Repositories/ExamRepository.php
@@ -386,7 +386,12 @@ class ExamRepository extends BaseRepository
         if ($user->exams()->where('status', ExamUser::STATUS_NORMAL)->exists()) {
             throw new NexusException(nexus_trans('exam.has_other_on_the_way', ['type_text' => $exam->typeText], $locale));
         }
-        $exists = ExamUser::query()->where('exam_id', $exam->id)->where("status", ExamUser::STATUS_NORMAL)->exists();
+        $exists = ExamUser::query()
+            ->where("uid", $uid)
+            ->where('exam_id', $exam->id)
+            ->where("status", ExamUser::STATUS_NORMAL)
+            ->exists()
+        ;
         if ($exists) {
             throw new NexusException(nexus_trans('exam.claimed_already', [], $locale));
         }