Possible EventEmitter memory leak detected

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(node:671) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 pmessage listeners added to [RedisClient]. Use emitter.setMaxListeners() to increase limit
    at _addListener (events.js:389:17)
    at RedisClient.addListener (events.js:405:10)
    at /usr/lib/node_modules/Haraka/node_modules/haraka-plugin-watch/index.js:148:18
    at RedisClient.<anonymous> (/usr/lib/node_modules/Haraka/node_modules/haraka-plugin-redis/index.js:183:13)
    at RedisClient.emit (events.js:314:20)
    at subscribe_unsubscribe (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:671:14)
    at return_pub_sub (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:729:9)
    at RedisClient.return_reply (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:761:9)
    at JavascriptRedisParser.returnReply (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:137:18)
    at JavascriptRedisParser.execute (/usr/lib/node_modules/Haraka/node_modules/redis-parser/lib/parser.js:544:14)
(node:644) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 pmessage listeners added to [RedisClient]. Use emitter.setMaxListeners() to increase limit
    at _addListener (events.js:389:17)
    at RedisClient.addListener (events.js:405:10)
    at /usr/lib/node_modules/Haraka/node_modules/haraka-plugin-watch/index.js:148:18
    at RedisClient.<anonymous> (/usr/lib/node_modules/Haraka/node_modules/haraka-plugin-redis/index.js:183:13)
    at RedisClient.emit (events.js:314:20)
    at subscribe_unsubscribe (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:671:14)
    at return_pub_sub (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:729:9)
    at RedisClient.return_reply (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:761:9)
    at JavascriptRedisParser.returnReply (/usr/lib/node_modules/Haraka/node_modules/redis/index.js:137:18)
    at JavascriptRedisParser.execute (/usr/lib/node_modules/Haraka/node_modules/redis-parser/lib/parser.js:544:14)
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