diff --git src/TimeLine.h src/TimeLine.h
index 46db996..7997c7b 100644
--- src/TimeLine.h
+++ src/TimeLine.h
@@ -115,8 +115,7 @@ class guTimeLine
 
     virtual void    TimerEvent( void );
     virtual int     TimerCreate( void );
-    virtual void    TimerDestroy( void ) { g_source_remove( m_TimerId ); }
-
+    virtual void    TimerDestroy( void ) { int id = m_TimerId; m_TimerId = 0; if (id) g_source_remove( id ); }
 };
 
 #endif