Timer failure

hmm, started getting this a while ago.  has happened a few times (like less than 5) over April and May wipe.

The event doesn't end; the gui stays up.  When I reload the plugin, it then ends and rewards items to the winner.

Timer of 600s has failed in 'Bot Purge Event v2.0.81 by Wrecks' [callback] (Object reference not set to an instance of an object)

at string Oxide.Plugins.BotPurgeEvent.GiveWinnerItemRewards(BasePlayer player) in C:/servers/green/carbon/plugins/BotPurgeEvent.cs:line 1008

at string Oxide.Plugins.BotPurgeEvent.HandleWinner(BasePlayer player, bool tie) in C:/servers/green/carbon/plugins/BotPurgeEvent.cs:line 902

at void Oxide.Plugins.BotPurgeEvent.AnnounceWinner(BasePlayer player, bool tie) in C:/servers/green/carbon/plugins/BotPurgeEvent.cs:line 875

at void Oxide.Plugins.BotPurgeEvent.EndBotPurgeEvent() in C:/servers/green/carbon/plugins/BotPurgeEvent.cs:line 852

at void Oxide.Plugins.BotPurgeEvent.EndEvent() in C:/servers/green/carbon/plugins/BotPurgeEvent.cs:line 747

at Timer Oxide.Plugins.Timers.In(float time, Action action)+() => { } in /home/runner/work/Carbon/Carbon/src/Carbon.Components/Carbon.Common/src/Oxide/Libraries/Timer.cs:line 50