An exception in RpcNep5Tracker plugin

[ProDog]

Describe the bug
An exception in RpcNep5Tracker plugin when transfer gas or neo.

Details:

System.Text.DecoderFallbackException
  HResult=0x80070057
  Message=Unable to translate bytes [FA] at index 0 from specified code page to Unicode.
  Source=System.Private.CoreLib
  StackTrace:
   at System.Text.DecoderExceptionFallbackBuffer.Throw(Byte[] bytesUnknown, Int32 index)
   at System.Text.DecoderExceptionFallbackBuffer.Fallback(Byte[] bytesUnknown, Int32 index)
   at System.Text.Encoding.GetCharCountWithFallback(ReadOnlySpan`1 bytes, Int32 originalBytesLength, DecoderNLS decoder)
   at System.Text.Encoding.GetCharCountWithFallback(Byte* pBytesOriginal, Int32 originalByteCount, Int32 bytesConsumedSoFar)
   at System.Text.UTF8Encoding.GetCharCount(Byte* bytes, Int32 count)
   at System.String.CreateStringFromEncoding(Byte* bytes, Int32 byteLength, Encoding encoding)
   at System.Text.Encoding.GetString(ReadOnlySpan`1 bytes)
   at Neo.VM.Helper.GetString(StackItem item) in D:\neo_code\neo\src\neo\VM\Helper.cs:line 201
   at Neo.Plugins.RpcNep5Tracker.HandleNotification(StoreView snapshot, IVerifiable scriptContainer, UInt160 scriptHash, Array stateItems, Dictionary`2 nep5BalancesChanged, UInt16& transferIndex) in D:\neo_code\neo-modules\src\RpcNep5Tracker\RpcNep5Tracker.cs:line 110
   at Neo.Plugins.RpcNep5Tracker.OnPersist(StoreView snapshot, IReadOnlyList`1 applicationExecutedList) in D:\neo_code\neo-modules\src\RpcNep5Tracker\RpcNep5Tracker.cs:line 165
   at Neo.Ledger.Blockchain.Persist(Block block) in D:\neo_code\neo\src\neo\Ledger\Blockchain.cs:line 449
   at Neo.Ledger.Blockchain.OnNewBlock(Block block) in D:\neo_code\neo\src\neo\Ledger\Blockchain.cs:line 336
   at Neo.Ledger.Blockchain.OnInventory(IInventory inventory, Boolean relay) in D:\neo_code\neo\src\neo\Ledger\Blockchain.cs:line 303
   at Neo.Ledger.Blockchain.OnReceive(Object message) in D:\neo_code\neo\src\neo\Ledger\Blockchain.cs:line 376
   at Akka.Actor.UntypedActor.Receive(Object message)
   at Akka.Actor.ActorBase.AroundReceive(Receive receive, Object message)
   at Akka.Actor.ActorCell.ReceiveMessage(Object message)
   at Akka.Actor.ActorCell.Invoke(Envelope envelope)

To Reproduce

1. Deploy a neo node and included the RpcNep5Tracker plugin;
2. Send a gas transfer transaction;
3. Wait for transaction confirmation and block persist.

Screenshots

Platform:

• OS: Windows 10 x64
• Version: latest version of master (neo, neo-vm, neo-modules, neo-node)

[shargon]

Could you add the steps that you followed?

[ProDog]

Could you add the steps that you followed?

Ok, added.

[Tommo-L]

@ProDog related to #265
@joeqian10 don't forget to have a check.