When I edit content, it always give me ERR_EMPTY_RESPONSE page

Hi, I am sure that I had setted base page for my AnsPress setting

This is my edit url, and it will return err_empty_response page to me.

http://xx.xx.xxx.x/discussion/?ap_page=edit&edit_post_id=672&__nonce=c5b72d27a1

Thank you !