sos! Application quit!

[ldx <ldxlq 263 net>]

Dear all,

Do you know why the following message appears and application exits?
  
  Gdk-ERROR ** BadWindow(invalid window parameter)
    Serial 12689 error_code 3  request_code 38  minor_code 0.

My program is written by gtk. And I doubt that this is caused by reentrance of some gtk function callings. It does not always appear, sometimes it happens and my program exits immediately. 

Any suggestion or method preciated!

Thanks in advance & best Regards,
ldx
2001-09-28