*Check IsInWorld() when calling GetMap() in RemoveFromWorld(). This may fix some crash bugs.

--HG--
branch : trunk

src/game/Object.cpp

@@ -1101,7 +1101,7 @@ void WorldObject::AddToWorld()
 
 void WorldObject::RemoveFromWorld()
 {
-    if(m_isActive && !isType(TYPEMASK_PLAYER))
+    if(m_isActive && IsInWorld() && !isType(TYPEMASK_PLAYER))
         GetMap()->RemoveActiveObject(this);
     Object::RemoveFromWorld();
 }