diff --git a/src/id_worker.cpp b/src/id_worker.cpp
index f9ea08a..85db722 100644
--- a/src/id_worker.cpp
+++ b/src/id_worker.cpp
@@ -161,6 +161,9 @@ uint64_t IdWorker::GetMaxId(uint64_t startId) const
     while ((flag & startId) == 0) {
         flag = flag << 1;
     }
+    if (startId + flag < 1) {
+        return 0;
+    }
     return (startId + flag - 1) > 0 ? (startId + flag - 1) : 0;
 }
 }