kuberxy opened a new issue #3158:
URL: https://github.com/apache/apisix/issues/3158
### Issue description
2020/12/29 18:38:10 [error] 9718#9718: *69019801 failed to run
balancer_by_lua*: /usr/local/share/lua/5.1/apisix/balancer.lua:99: attempt to
index local 'checker' (a nil value)
stack traceback:
/usr/local/share/lua/5.1/apisix/balancer.lua:99: in function
'create_obj_fun'
/usr/local/share/lua/5.1/apisix/core/lrucache.lua:92: in function
'lrucache_checker'
/usr/local/share/lua/5.1/apisix/balancer.lua:135: in function
'fetch_healthchecker'
/usr/local/share/lua/5.1/apisix/balancer.lua:208: in function
'pick_server'
/usr/local/share/lua/5.1/apisix/balancer.lua:272: in function
'load_balancer'
/usr/local/share/lua/5.1/apisix/init.lua:748: in function
'http_balancer_phase'
balancer_by_lua:2: in main chunk while connecting to upstream,
client: 192.168.2.11, server: , request: "GET
/question/bag/getQuestions?id=bGl1c2hlbmd5aV2QuPZIGWaI&offset=0&limit=20&pushId=4caf4e1b-a65a-48d1-ab63-86e8a6dd26f6
HTTP/1.0", host: "hyb.com"
### Environment
* apisix version (cmd: `apisix version`): 2.1
* OS: (cmd: `uname -a`) 4.15.0-111-generic Ubuntu 18.04
* OpenResty / Nginx version: (cmd: `nginx -V` or `openresty -V`)
openresty/1.15.8.3
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