webnet cgi 回调 出现assert

msh />[436] I/wn: RT-Thread webnet package (V2.0.2) initialize success.
[9079] W/app.web: [cgi_handler_about]:[29]
[24067] W/app.web: [cgi_handler_about]:[29]
tcp_write: arg == NULL (programmer violates API)
Assertion: 430 in ../rt-thread/components/net/lwip-2.1.0/src/core/tcp_out.c, thread webnet
(0) assertion failed at function:sys_arch_assert, line number:637