An unhandled exception of Type 'System. stackoverflowexception 'occurred in system. Window

Written Program, The error message is displayed when the form is disabled:
An unhandled exception of Type 'System. stackoverflowexception 'occurred in system. Windows. Forms. dll

After the interruption, locate this. Close ();
Because the form has timing or something, I went to the Internet and checked the endless loops related to stack overflow and threads for a day. Finally, let someone help me to see the cause of the error,
It turns out that I call this. Close () again in form_formclosed () and call myself, and the result is dead.
I haven't found this problem for a whole day. t_t