diff --git a/SQCSim2021/engine.cpp b/SQCSim2021/engine.cpp
index 57dd6ff..a7ca3d4 100644
--- a/SQCSim2021/engine.cpp
+++ b/SQCSim2021/engine.cpp
@@ -309,6 +309,8 @@ int Engine::GetCountdown(float elapsedTime) {
 		m_countdown = m_time + COUNTDOWN;
 		m_resetcountdown = false;
 	}
+	if (m_countdown < m_time)
+		Stop();
 	if(!m_stopcountdown)
 		m_time += elapsedTime;
 	return m_countdown - (int)m_time;