/76561199024737825/blablatoscope disconnecting: Exception (cs:53721): NotImplementedException: Unknown wire type: 3 SilentOrbit.ProtocolBuffers.ProtocolParser.SkipKey (System.IO.Stream stream, SilentOrbit.ProtocolBuffers.Key key) (at <00000000000000000000000000000000>:0) ProtoBuf.WorldMessage.Deserialize (System.IO.Stream stream) (at <00000000000000000000000000000000>:0) WorldNetworking.OnMessageReceived (Network.Message message) (at <00000000000000000000000000000000>:0) Client.OnNetworkMessage (Network.Message packet) (at <00000000000000000000000000000000>:0) Facepunch.Network.Raknet.Client.HandleMessage () (at <00000000000000000000000000000000>:0) Facepunch.Network.Raknet.Client.Cycle () (at <00000000000000000000000000000000>:0) Client.Update () (at <00000000000000000000000000000000>:0) UnityEngine.Debug:LogException(Exception) Facepunch.Network.Raknet.Client:HandleMessage() Facepunch.Network.Raknet.Client:Cycle() Client:Update()
ExType: JsonSerializationException
Failed to call hook 'OnPlayerConnected' on plugin 'StatisticsDB v1.2.6' (ArgumentException: Could not cast or convert from System.String to Oxide.Plugins.StatisticsDB+PlayerStats.)
at Newtonsoft.Json.Utilities.ConvertUtils.EnsureTypeAssignable (System.Object value, System.Type initialType, System.Type targetType) [0x00062] in <7126fb4f5c5b40029458a4f975f98d13>:0
at Newtonsoft.Json.Utilities.ConvertUtils.ConvertOrCast (System.Object initialValue, System.Globalization.CultureInfo culture, System.Type targetType) [0x00031] in <7126fb4f5c5b40029458a4f975f98d13>: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) [0x0008d] in <7126fb4f5c5b40029458a4f975f98d13>:0

Are there any other details other than that?

It happened after restarting(wiping) the server. 
For a couple of players until I unloaded it.

o.load StatisticsDB
StatisticsDB was compiled successfully in 2391ms

ExType: JsonSerializationException
Failed to call hook 'OnServerInitialized' on plugin 'StatisticsDB v1.2.6' (ArgumentException: Could not cast or convert from System.String to Oxide.Plugins.StatisticsDB+PlayerStats.)
at Newtonsoft.Json.Utilities.ConvertUtils.EnsureTypeAssignable (System.Object value, System.Type initialType, System.Type targetType) [0x00062] in <7126fb4f5c5b40029458a4f975f98d13>:0
at Newtonsoft.Json.Utilities.ConvertUtils.ConvertOrCast (System.Object initialValue, System.Globalization.CultureInfo culture, System.Type targetType) [0x00031] in <7126fb4f5c5b40029458a4f975f98d13>: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) [0x0008d] in <7126fb4f5c5b40029458a4f975f98d13>:0

Loaded plugin Statistics DB v1.2.6 by Iv Misticos
Failed to call hook 'OnPlayerDisconnected' on plugin 'StatisticsDB v1.2.6' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.StatisticsDB.OnPlayerDisconnected (BasePlayer player) [0x0000b] in <8fb78e63825046099f95917cc0888919>:0
at Oxide.Plugins.StatisticsDB.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00429] in <8fb78e63825046099f95917cc0888919>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <d09a1f46ca2f4432811bcfe45ad13c7b>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <cf88a28c7fb44d36890d85a78331cc9d>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <cf88a28c7fb44d36890d85a78331cc9d>:0

o.unload StatisticsDB
Unloaded plugin Statistics DB v1.2.6 by Iv Misticos

Merged post

Endless issues, any planned fix soon?

I don't think it can read json from database. Can you verify JSON in database is valid?