I wasn't able to ban myself while testing, this is the error message.

[EnhancedBanSystem] at Oxide.Plugins.EnhancedBanSystem.PlayerDatabase_ExecuteBan (Oxide.Plugins.EnhancedBanSystem+BanData bandata) [0x0002d] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.ExecuteBan (System.Object source, Oxide.Plugins.EnhancedBanSystem+BanData bandata, System.Boolean kick) [0x0003a] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.PrepareBan (System.Object source, System.String userID, System.String name, System.String ip, System.String reason, System.Double duration, System.Boolean kick) [0x0000f] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.BanPlayer (System.Object source, Oxide.Core.Libraries.Covalence.IPlayer player, System.String reason, System.Double duration) [0x00016] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.TryBan (System.Object source, System.String[] args) [0x0011a] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.cmdBan (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x00067] in <bf7549f762ee4caaa0249e3c150a1299>:0

@Wulf, I could. But the only reason I didn't in the first place was because that's the only error message related to the Enhanced Ban System Plug-in. Is there any other things I could provide ?

(As a disclaimer, the banned was issued at 16:44)

(16:44:05) | ERROR:Object reference not set to an instance of an object
(16:44:05) | [EnhancedBanSystem] at Oxide.Plugins.EnhancedBanSystem.PlayerDatabase_ExecuteBan (Oxide.Plugins.EnhancedBanSystem+BanData bandata) [0x0002d] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.ExecuteBan (System.Object source, Oxide.Plugins.EnhancedBanSystem+BanData bandata, System.Boolean kick) [0x0003a] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.PrepareBan (System.Object source, System.String userID, System.String name, System.String ip, System.String reason, System.Double duration, System.Boolean kick) [0x0000f] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.BanPlayer (System.Object source, Oxide.Core.Libraries.Covalence.IPlayer player, System.String reason, System.Double duration) [0x00016] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.TryBan (System.Object source, System.String[] args) [0x0011a] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.cmdBan (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x00067] in <bf7549f762ee4caaa0249e3c150a1299>:0

In addition to that, I have seen this message pop up randomly 

Failed to call hook 'CanUserLogin' on plugin 'EnhancedBanSystem v5.2.3' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.EnhancedBanSystem.PlayerDatabase_IsBanned (System.String steamid, System.String ip, Oxide.Plugins.EnhancedBanSystem+BanData& bandata) [0x0002f] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.isBanned_NonDelayed (System.String name, System.String steamid, System.String ip, System.Boolean update, Oxide.Plugins.EnhancedBanSystem+BanData& bandata) [0x0006b] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.CanUserLogin (System.String name, System.String id, System.String ip) [0x00012] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.EnhancedBanSystem.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x01523] in <bf7549f762ee4caaa0249e3c150a1299>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0​

Hey, been trying to fix this issue for hours, i've tried everything I could think of, nothing seems to want to fix it. 

The error in console: 

[Enhanced Ban System] at Oxide.Plugins.EnhancedBanSystem.PlayerDatabase_ExecuteBan (Oxide.Plugins.EnhancedBanSystem+BanData bandata) [0x0002d] in <9e9829d98e6940078e3adc314291e869>:0
at Oxide.Plugins.EnhancedBanSystem.ExecuteBan (System.Object source, Oxide.Plugins.EnhancedBanSystem+BanData bandata, System.Boolean kick) [0x0003a] in <9e9829d98e6940078e3adc314291e869>:0
at Oxide.Plugins.EnhancedBanSystem.PrepareBan (System.Object source, System.String userID, System.String name, System.String ip, System.String reason, System.Double duration, System.Boolean kick) [0x0000f] in <9e9829d98e6940078e3adc314291e869>:0
at Oxide.Plugins.EnhancedBanSystem.BanPlayer (System.Object source, Oxide.Core.Libraries.Covalence.IPlayer player, System.String reason, System.Double duration) [0x00016] in <9e9829d98e6940078e3adc314291e869>:0
at Oxide.Plugins.EnhancedBanSystem.TryBan (System.Object source, System.String[] args) [0x0011a] in <9e9829d98e6940078e3adc314291e869>:0
at Oxide.Plugins.EnhancedBanSystem.cmdBan (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x00067] in <9e9829d98e6940078e3adc314291e869>:0

The Error in game: 

ERROR: Object reference not set to an instance of an object

Any advice helps! I've legit tried everything, and I can only find one other person who had this issue on this forum but his solution did not work either. 

This is what I get when Trying to ban!!

(22:57:12) | [Enhanced Ban System]   at Newtonsoft.Json.JsonTextReader.ParseValue () [0x002b3] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonTextReader.Read () [0x0004c] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonReader.ReadAndMoveToContent () [0x00000] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType (Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonContract contract, System.Boolean hasConverter) [0x00043] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, System.Boolean checkAdditionalContent) [0x000d9] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00053] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x0002d] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <45c13f2b01574d8b82248736e42013a4>:0 
  at Oxide.Plugins.EnhancedBanSystem.PlayerDatabase_ExecuteBan (Oxide.Plugins.EnhancedBanSystem+BanData bandata) [0x00065] in <3a1f8217ad784f118b6a3da09aa4c768>:0 
  at Oxide.Plugins.EnhancedBanSystem.ExecuteBan (System.Object source, Oxide.Plugins.EnhancedBanSystem+BanData bandata, System.Boolean kick) [0x0003a] in <3a1f8217ad784f118b6a3da09aa4c768>:0 
  at Oxide.Plugins.EnhancedBanSystem.PrepareBan (System.Object source, System.String userID, System.String name, System.String ip, System.String reason, System.Double duration, System.Boolean kick) [0x0000f] in <3a1f8217ad784f118b6a3da09aa4c768>:0 
  at Oxide.Plugins.EnhancedBanSystem.BanPlayer (System.Object source, Oxide.Core.Libraries.Covalence.IPlayer player, System.String reason, System.Double duration) [0x00016] in <3a1f8217ad784f118b6a3da09aa4c768>:0 
  at Oxide.Plugins.EnhancedBanSystem.TryBan (System.Object source, System.String[] args) [0x0011a] in <3a1f8217ad784f118b6a3da09aa4c768>:0 
  at Oxide.Plugins.EnhancedBanSystem.cmdBan (Oxide.Core.Libraries.Covalence.IPlayer player, System.String command, System.String[] args) [0x00067] in <3a1f8217ad784f118b6a3da09aa4c768>:0