ShaoZeMing commented on issue #3437:
URL: https://github.com/apache/apisix/issues/3437#issuecomment-768818418
apisix/logs/error.log
```
2021/01/28 05:52:18 [warn] 49#49: *1 [lua] plugin.lua:206: load_stream():
new plugins: {"mqtt-proxy":true}, context: init_worker_by_lua*
2021/01/28 05:52:18 [warn] 50#50: *2 [lua] plugin.lua:206: load_stream():
new plugins: {"mqtt-proxy":true}, context: init_worker_by_lua*
2021/01/28 05:52:18 [warn] 51#51: *3 [lua] plugin.lua:206: load_stream():
new plugins: {"mqtt-proxy":true}, context: init_worker_by_lua*
2021/01/28 05:52:18 [warn] 52#52: *4 [lua] plugin.lua:206: load_stream():
new plugins: {"mqtt-proxy":true}, context: init_worker_by_lua*
2021/01/28 05:52:18 [warn] 55#55: *5 [lua] plugin.lua:206: load_stream():
new plugins: {"mqtt-proxy":true}, context: init_worker_by_lua*
2021/01/28 05:52:18 [warn] 49#49: *7 [lua] init.lua:288:
sync_local_conf_to_etcd(): sync local conf to etcd, context: ngx.timer
2021/01/28 05:52:50 [error] 51#51: *2271 failed to run
header_filter_by_lua*: /usr/local/apisix/apisix/core/lrucache.lua:159: invalid
value (nil) at index 1 in table for 'concat'
stack traceback:
[C]: in function 'concat'
/usr/local/apisix/apisix/core/lrucache.lua:159: in function
'plugin_ctx'
/usr/local/apisix/apisix/plugins/cors.lua:168: in function
'phase_func'
/usr/local/apisix/apisix/init.lua:164: in function 'run_plugin'
/usr/local/apisix/apisix/init.lua:625: in function 'common_phase'
/usr/local/apisix/apisix/init.lua:662: in function
'http_header_filter_phase'
header_filter_by_lua:2: in main chunk, client: 192.168.0.139,
server: , request: "GET / HTTP/1.1", host: "192.168.3.130"
```
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