diff --git a/SQCSim-srv/server.cpp b/SQCSim-srv/server.cpp
index 7320d3b..63b4a3d 100644
--- a/SQCSim-srv/server.cpp
+++ b/SQCSim-srv/server.cpp
@@ -222,6 +222,8 @@ void Server::Log(std::string str, bool is_error = false, bool is_fatal = false)
 	}
 
 	if (is_fatal) {
+		if (m_logfile.is_open())
+			m_logfile.close();
 		if (m_sock_udp)
 			closesocket(m_sock_udp);
 		if (m_sock_tcp)