Crash in _lv_event_mark_deleted() when call lv_obj_del() or lv_obj_del_async about lvgl HOT 3 CLOSED

@kisvegabor Thank you very much for reply.
Last week I found where is this crashing problem from.
I have registered custom event code by lv_event_register_id(), and send to my new create object by lv_event_send(), this cause the poiter problem. After not use the cusom event code, lv_obj_del() works well.

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I've tested your code and it works well for me. A few ideas:

• lv_obj_is_valid is not safe to use this way. It can happen that a widget was freed and on it's exact memory address an other widget was allocated. lv_obj_is_valid will say that it's valid, but it's still not the widget that you wanted.
• Try increasing the stack size of the LVGL task.

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