diff --git a/src/json/ScanJson.cpp b/src/json/ScanJson.cpp
index adae9c3..30e2ec5 100644
--- a/src/json/ScanJson.cpp
+++ b/src/json/ScanJson.cpp
@@ -14,7 +14,8 @@ void ScanJson::save() {
     }
     QFile f(QString("%1/jsons/%2.json").arg(QCoreApplication::applicationDirPath(),scanID.c_str()));
     f.open(QFileDevice::ReadWrite);
-    cJSON_AddItemToObject(root, "EmptyScanID", cJSON_CreateString(emptyScanID.c_str()));
+    cJSON_AddItemToObject(root, "EmptyScanID",
+            cJSON_CreateString(emptyScanID.empty()?JsonObject::Instance()->getEmptyScanID():emptyScanID.c_str()));
     cJSON_AddItemToObject(root, "ScanID", cJSON_CreateString(scanID.c_str()));
     char* content = cJSON_Print(root);
     f.write(content);