ilsnk

Results 2 issues of ilsnk

**At random time we have this:** ``` CS Unhandled exception. System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'length') at System.Runtime.CompilerServices.RuntimeHelpers.GetSubArray[T](T[] array, Range range) at NetCoreServer.WebSocket.PrepareReceiveFrame(Byte[]...

I don't know the steps to reproduce, but someone, tell me where to wear a fix? ``` Unhandled exception. System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values....