Crashes on Linux with Mono

[TheOtherUnknown]

Traceback:

Unhandled Exception:
System.ArgumentException: SendKeys string {0} is not valid.
Parameter name: {(}
  at System.Windows.Forms.SendKeys.Parse (System.String key_string) [0x0015c] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at System.Windows.Forms.SendKeys.Send (System.String keys) [0x00000] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at System.Windows.Forms.SendKeys.SendWait (System.String keys) [0x00010] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at AutoPaster.MainForm+<>c__DisplayClass1_0.<btnType_Click>b__0 (System.Object x) [0x00031] in <86195e09380e46a1b75848256dfe749a>:0 
  at System.Threading.Timer+Scheduler.TimerCB (System.Object o) [0x00007] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () [0x00008] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00074] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in <eabff256da0b4c4db432852f93333375>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentException: SendKeys string {0} is not valid.
Parameter name: {(}
  at System.Windows.Forms.SendKeys.Parse (System.String key_string) [0x0015c] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at System.Windows.Forms.SendKeys.Send (System.String keys) [0x00000] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at System.Windows.Forms.SendKeys.SendWait (System.String keys) [0x00010] in <6d04630604b24bb0bd1a94de821c9d88>:0 
  at AutoPaster.MainForm+<>c__DisplayClass1_0.<btnType_Click>b__0 (System.Object x) [0x00031] in <86195e09380e46a1b75848256dfe749a>:0 
  at System.Threading.Timer+Scheduler.TimerCB (System.Object o) [0x00007] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () [0x00008] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00074] in <eabff256da0b4c4db432852f93333375>:0 
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in <eabff256da0b4c4db432852f93333375>:

Mono information:

Mono JIT compiler version 5.16.0 (makepkg/bb3ae37d71a Sat Dec  8 13:21:35 CET 2018)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug 
        Interpreter:   yes
        LLVM:          supported, not enabled.
        GC:            sgen (concurrent by default)

This error occurs after pressing the "Paste" button.