Version 0.5.6.1 does not work on linux using mono

[AlexALX]

Version 0.5.6.1 does not work on linux using mono, got crash on server startup:

Failed to load server, Exception was Exception: NullReferenceException
Message:Object reference not set to an instance of an object
Source:0Harmony

System.NullReferenceException: Object reference not set to an instance of an object
  at Harmony.ILCopying.Memory.WriteBytes (System.Int64 memory, System.Byte[] values) [0x0000c] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.ILCopying.Memory.WriteJump (System.Int64 memory, System.Int64 destination) [0x00041] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.ILCopying.Memory.DetourMethod (System.Reflection.MethodBase original, System.Reflection.MethodBase replacement) [0x0003b] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.PatchFunctions.UpdateWrapper (System.Reflection.MethodBase original, Harmony.PatchInfo patchInfo, System.String instanceID) [0x00056] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.PatchProcessor.Patch () [0x000e4] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.HarmonyInstance.<PatchAll>b__9_0 (System.Type type) [0x0002c] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.CollectionExtensions.Do[T] (System.Collections.Generic.IEnumerable`1[T] sequence, System.Action`1[T] action) [0x0001b] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Harmony.HarmonyInstance.PatchAll (System.Reflection.Assembly assembly) [0x00007] in <ea592bdb61774af08c3f432fec48ded1>:0
  at Asphalt.Api.Asphalt..cctor () [0x00033] in <f0a49a6b2586428eb7da139783ce61b3>:0

But 0.5.6.0 seems to be working, but with exit issue (must send exit command instead).

[manureini]

Hello ;)
Yes this is an issue, but I have no idea to fix it.
Afaik 9.0 will use .Net Core (I think currently not official confirmed). So we don't need it in the future anyway. But if you know a fix feel free to pr :P