diff --git a/cmd/go-judge/stream/stream.go b/cmd/go-judge/stream/stream.go
index 832b1a8..530264b 100644
--- a/cmd/go-judge/stream/stream.go
+++ b/cmd/go-judge/stream/stream.go
@@ -79,15 +79,19 @@ func Start(baseCtx context.Context, s Stream, w worker.Worker, srcPrefix []strin
 	if err != nil {
 		return fmt.Errorf("convert exec request: %w", err)
 	}
-	logger.Sugar().Debugf("request: %+v", rq)
-	defer func() {
+	closeFunc := func() {
 		for _, f := range streamIn {
 			f.Close()
 		}
+		streamIn = nil
 		for _, f := range streamOut {
 			f.Close()
 		}
-	}()
+		streamOut = nil
+	}
+	defer closeFunc()
+
+	logger.Sugar().Debugf("request: %+v", rq)
 
 	var wg errgroup.Group
 	execCtx, execCancel := context.WithCancel(baseCtx)
@@ -120,6 +124,8 @@ func Start(baseCtx context.Context, s Stream, w worker.Worker, srcPrefix []strin
 	err = sendLoop(ctx, s, outCh, rtCh, logger)
 
 	cancel()
+	closeFunc()
+	streamOut = nil
 	wg.Wait()
 	return err
 }
diff --git a/cmd/go-judge/ws_executor/websocket.go b/cmd/go-judge/ws_executor/websocket.go
index 9618348..c361f65 100644
--- a/cmd/go-judge/ws_executor/websocket.go
+++ b/cmd/go-judge/ws_executor/websocket.go
@@ -197,7 +197,10 @@ func (h *wsHandle) handleStream(c *gin.Context) {
 
 	w := &streamWrapper{ctx: ctx, conn: conn, sendCh: make(chan stream.Response)}
 	go w.sendLoop()
-	stream.Start(ctx, w, h.worker, h.srcPrefix, h.logger)
+	if err := stream.Start(ctx, w, h.worker, h.srcPrefix, h.logger); err != nil {
+		h.logger.Sugar().Debugln("stream start: ", err)
+		c.Error(err)
+	}
 }
 
 type contextMap struct {