[lwip-users] Assertion : "tcp_enqueue: no pbufs on queue => both queues empty"

[Amir Bukhari]

I use lwip in a embedded system, one time I have got this the following message:
"tcp_enqueue: no pbufs on queue => both queues empty"
Exactly on this line:
LWIP_ASSERT("tcp_enqueue: no pbufs on queue => both queues empty",
      pcb->unacked == NULL && pcb->unsent == NULL);

in tcp_out.c

what case such assertion?
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Amir Bukhari
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