problem with icecat

[gil]

hello
i have this problem with icecat 3.5.5
$ icecat
The program 'icecat-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
 (Details: serial 2189 error_code 3 request_code 20 minor_code 0)
 (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 --sync command line
  option to change this behavior. You can then get a meaningful
  backtrace from your debugger if you break on the gdk_x_error() function.)

if anyone knows how to fix it or show me a link would be grateful veins

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