(21:44:11) | Loaded plugin ServerArmour v0.1.2 by Pho3niX90
(21:44:14) | Failed to run a 1.00 timer in 'ServerArmour v0.1.2' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.ServerArmour.AddBan (Oxide.Core.Libraries.Covalence.IPlayer player, Oxide.Plugins.ServerArmour+ISABan thisBan) [0x00021] in <00f36d71988944d4b0d77fbd15521c06>:0
at Oxide.Plugins.ServerArmour+<CheckLocalBans>c__AnonStorey3.<>m__0 () [0x000fa] in <00f36d71988944d4b0d77fbd15521c06>:0
at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ac41dd3599754d448b8c218b34645820>:0

(02:35:51) | Failed to run a 1.00 timer in 'ServerArmour v0.1.4' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ServerArmour.AddBan (Oxide.Core.Libraries.Covalence.IPlayer player, Oxide.Plugins.ServerArmour+ISABan thisBan) [0x00021] in <5049a98c4bfd4b29948f7c70c829d71e>:0 
  at Oxide.Plugins.ServerArmour+<CheckLocalBans>c__AnonStorey3.<>m__0 () [0x000fa] in <5049a98c4bfd4b29948f7c70c829d71e>:0 
  at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ac41dd3599754d448b8c218b34645820>:0

Merged post

(02:35:39) | Web request callback raised an exception (InvalidCastException: Null object cannot be converted to a value type.)
  at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in <437ba245d8404784b9fbab9b439ac908>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType (Newtonsoft.Json.JsonReader reader, System.Object value, System.Globalization.CultureInfo culture, Newtonsoft.Json.Serialization.JsonContract contract, System.Type targetType) [0x0007c] in <7126fb4f5c5b40029458a4f975f98d13>:0

Thank you for this, I will investigate and push a fix.