diff --git a/server/websocket/internal/logic/ws_ok_response.go b/server/websocket/internal/logic/ws_ok_response.go
index a64db391..0d2dab18 100644
--- a/server/websocket/internal/logic/ws_ok_response.go
+++ b/server/websocket/internal/logic/ws_ok_response.go
@@ -15,10 +15,10 @@ func (w *wsConnectItem) sendCombineImageStepResponseMessage(renderId, requestId,
 	}
 	combineTakesTime := "cache"
 	uploadCombineImageTakesTime := "cache"
-	if debugData.DiffTimeLogoCombine > 0 {
+	if debugData != nil && debugData.DiffTimeLogoCombine > 0 {
 		combineTakesTime = fmt.Sprintf("%dms", debugData.DiffTimeLogoCombine)
 	}
-	if debugData.DiffTimeUploadFile > 0 {
+	if debugData != nil && debugData.DiffTimeUploadFile > 0 {
 		uploadCombineImageTakesTime = fmt.Sprintf("%dms", debugData.DiffTimeUploadFile)
 	}
 	w.sendToOutChan(w.respondDataFormat(constants.WEBSOCKET_COMBINE_IMAGE, websocket_data.CombineImageRspMsg{