Code:
L 07/15/2011 - 03:07:32: [SM] Native "FindEntityByClassname" reported: Entity 65472 is not valid
L 07/15/2011 - 03:07:32: [SM] Displaying call stack trace for plugin "ponyspenser.smx":
L 07/15/2011 - 03:07:32: [SM] [0] Line 128, D:\Programs\Steam\SteamApps\robokymk2\source 2007 dedicated server\tf\addons\sourcemod\scripting\ponyspenser\ponyspenser.sp::Timer_CheckDisp()
That happens once in a while