diff --git a/packages/hydrooj/src/error.ts b/packages/hydrooj/src/error.ts
index ae74765b6..44d764584 100644
--- a/packages/hydrooj/src/error.ts
+++ b/packages/hydrooj/src/error.ts
@@ -141,6 +141,7 @@ global.Hydro.error = {
     ProblemNotFoundError,
     TrainingNotFoundError,
     ContestNotFoundError,
+    ContestNotEndedError,
     RecordNotFoundError,
     SolutionNotFoundError,
     AlreadyVotedError,