Die on emoji key click

[Flashwalker]

onboard die on start with emoji layout if i click any emoji key

$ onboard

(onboard:215586): Gdk-ERROR **: 23:07:07.566: The program 'onboard' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 25533 error_code 2 request_code 135 (XKEYBOARD) minor_code 9)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)