diff --git a/libs/submissions_process.js b/libs/submissions_process.js
index c18a932..76e78da 100644
--- a/libs/submissions_process.js
+++ b/libs/submissions_process.js
@@ -5,8 +5,8 @@ const getSubmissionInfo = (s, displayConfig) => {
   return {
     submissionId: s.id,
     taskId: s.task_id,
-    user: s.user.username,
-    userId: s.user_id,
+    user: s.is_anonymous ? null: s.user.username,
+    userId: s.is_anonymous ? null : s.user_id,
     problemName: s.problem.title,
     problemId: s.problem_id,
     language: displayConfig.showCode ? ((s.language != null && s.language !== '') ? syzoj.languages[s.language].show : null) : null,