diff --git a/main.cpp b/main.cpp
index b84cddc..fddb886 100644
--- a/main.cpp
+++ b/main.cpp
@@ -132,7 +132,7 @@ long long get_file_timestamp(const std::string& strPath)
     std::string str;
     if (strPath.empty())
     {
-        return str;
+        return 0;
     }    
     str = path.filename().string();
     auto strTime = str.substr(0, 15);