Gdk-ERROR,请高手帮忙

我的一个项目用Gtk开发的，项目中有多个线程，还有一个更新界面的计时器函数，我的linux版本是fedora8，我每天晚上让程序通宵运行进行测试，每次运行几小时（也可能是十几小时）后就会报错然后异常终止，错误如下：
Gdk-ERROR **: The program 'dzjc' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadIDChoice (invalid resource ID chosen for this connection)'.
(Details: serial 14006053 error_code 14 request_code 155 minor_code 4)
(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.)
aborting...

请高手帮忙看看，这个错误可能是什么原因引起的，因为代码太多，所以没法贴了。
今天早上来的时候程序再次崩溃，我在计时器函数的界面更新代码前后加上了gdk_threads_enter()和gdk_threads_leave()，正在测试中，不知道有没有用。