diff --git a/source/vibe/core/core.d b/source/vibe/core/core.d
index 4b85687..d02bc9e 100644
--- a/source/vibe/core/core.d
+++ b/source/vibe/core/core.d
@@ -1114,7 +1114,7 @@ struct Timer {
 
 	/** Resets the timer and avoids any firing.
 	*/
-	void stop() nothrow { m_driver.stop(m_id); }
+	void stop() nothrow { if (m_driver) m_driver.stop(m_id); }
 
 	/** Waits until the timer fires.
 	*/