Just noticed within recent weeks/wipes that it stopped working and I've been getting this in console

Failed to run a 2.80 timer in 'SupplySignalAlerts v3.0.1' (NullReferenceException: )
  at (wrapper managed-to-native) UnityEngine.Component.get_transform(UnityEngine.Component)
  at Oxide.Plugins.SupplySignalAlerts+<>c__DisplayClass2_0.b__0 () [0x00026] in <150fbec377df483da311b70dc7f5ea50>:0 
  at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <18d4f19bbc844191b11ed9e69284d09b>:0 ​