6b9882fc14
If idle connection was closed before h1proto had been allocated then c->socket.data is NULL. This happens if nxt_h1p_idle_response() is called by nxt_h1p_idle_close(). However, h1p->conn_write_tail is used only in nxt_h1p_request_send() that would not be called after nxt_h1p_idle_response(). The bug was introduced in f237e8c553fd.
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