Kong: 尝试索引字段'host'(一个nil值)

[Kong] 遇到错误: 尝试索引字段'host' (一个nil值)

当我在高负载下使用kong时，我遇到了这个问题，堆栈跟踪如下:

2019/10/16 07:12:28 [error] 253#0: *109865 lua entry thread aborted: runtime error: /usr/local/share/lua/5.1/resty/dns/balancer/base.lua:211: attempt to index field 'host' (a nil value)
stack traceback:
coroutine 0:
        /usr/local/share/lua/5.1/resty/dns/balancer/base.lua: in function 'getPeer'
        /usr/local/share/lua/5.1/resty/dns/balancer/ring.lua:319: in function 'getPeer'
        /usr/local/share/lua/5.1/kong/runloop/balancer.lua:834: in function 'execute'
        /usr/local/share/lua/5.1/kong/runloop/handler.lua:753: in function 'balancer_execute'
        /usr/local/share/lua/5.1/kong/runloop/handler.lua:1260: in function 'after'
        /usr/local/share/lua/5.1/kong/init.lua:745: in function 'access'
        access_by_lua(nginx-kong.conf:89):2: in main chunk