diff --git a/libs/submissions_process.js b/libs/submissions_process.js
index b068d40..b9eb89c 100644
--- a/libs/submissions_process.js
+++ b/libs/submissions_process.js
@@ -15,7 +15,7 @@ const getSubmissionInfo = (s, displayConfig) => ({
 
 const getRoughResult = (x, displayConfig, roughOnly) => {
   let max = 0;
-  if (x.result.judge) {
+  if (x && x.result && x.result.judge) {
     _.forEach(x.result.judge.subtasks, function (item) {
       _.forEach(item.cases, function (one) {
         max = Math.max(max, one.result.time);