Connection error nodejs to mysql

[Yair js Avendaño]

Hi, I'm working with the etherpad I'm using an ep_frontend_community plugin but I throw this mysql error.

console - TypeError: Cannot read property '0' of null
    at /var/www/site/softwa/etherpad-lite-1.6.1/node_modules/ep_frontend_community/hooks.js:1819:58
    at Query._callback (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/ep_frontend_community/hooks.js:203:13)
    at Query.Sequence.end (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/sequences/Sequence.js:75:24)
    at Query._handleFinalResultPacket (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/sequences/Query.js:143:8)
    at Query.EofPacket (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/sequences/Query.js:127:8)
    at Protocol._parsePacket (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/Protocol.js:172:24)
    at Parser.write (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/Parser.js:62:12)
    at Protocol.write (/var/www/site/softwa/etherpad-lite-1.6.1/node_modules/mysql/lib/protocol/Protocol.js:37:16)
    at Socket.ondata (_stream_readable.js:542:20)
    at emitOne (events.js:82:20)