Someone

at (wrapper managed-to-native) System.Runtime.InteropServices.Marshal.FreeHGlobal (intptr) <0x0000b>
  at (wrapper managed-to-native) System.Runtime.InteropServices.Marshal.FreeHGlobal (intptr) <0xffffffff>
  at System.IO.Compression.DeflateStream.Dispose (bool) <0x0007a>
  at System.IO.Stream.Close () <0x0001c>
  at System.IO.Stream.Dispose () <0x00017>
  at (wrapper remoting-invoke-with-check) System.IO.Stream.Dispose () <0xffffffff>
  at System.IO.Compression.GZipStream.Dispose (bool) <0x00047>
  at System.IO.Stream.Close () <0x0001c>
  at MoorHunt.HTTPClient.ReadStringResponse (System.IO.Stream) <0x00311>
  at MoorHunt.HTTPClient.GetStringResponse (string,string,string) <0x0004d>
  at MoorHunt.HTTPClient.GetStringResponse (string,string) <0x00037>
  at MoorHunt.Net.MailClients.o2Client.Login (string,string) <0x00424>
  at MoorHunt.MailClient.Login () <0x0002b>
  at MoorHunt.Controls.xa9431359ef884a55.x5ea9f55537f87e34 (object) <0x00181>
  at (wrapper delegate-invoke) System.MulticastDelegate.invoke_void_object (object) <0xffffffff>
  at (wrapper runtime-invoke) System.Threading.ParameterizedThreadStart.runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

        mono [0x51fc51]
        /lib/libpthread.so.0 [0x2ad96207af90]
        /lib/libc.so.6(gsignal+0x35) [0x2ad96230c8d5]
        /lib/libc.so.6(abort+0x10e) [0x2ad96230db6e]
        /lib/libc.so.6 [0x2ad962342987]
        /lib/libc.so.6 [0x2ad962347a7d]
        /lib/libc.so.6(__libc_free+0x76) [0x2ad9623490a6]
        [0x404e617a]