I know. It was my fault, I accidentally commented out my only method of keeping track of the tank. In a later version I'll get rid of that tracking method and just ID the tank by the player entity classname.
I apologize for the inconvenience. I've updated the attachments to show this change.
Tell me if it keeps offering the tank to the same person, because I'll have to wait till tomorrow to test that one out. The tank mods should be fine.
edit: Oh yeah, if two tanks happen to be spawning, check your plugins folder. Chances are there are two Chase_4_Dead (Chase4Dead) plugins in there which are running at the same time. Delete the one without the underscores.
edit: Ignore that last edit. But if two tanks are spawning, you have sv_cheats on or duplicate chase 4 dead plugins.