Some jobs of tilerator are invalid

[HansonYip]

Several jobs on zoom level 14 are invalid. But after restarting the tilerator, including tileratorUI and tilerator-workers, these jobs can be processed successfully. Some parts of error log are shown as below:

�[36mtilerator_1         |�[0m Error: job "185" is invalid
�[36mtilerator_1         |�[0m     at Command.callback (/opt/tilerator/node_modules/kue/lib/queue/job.js:182:17)
�[36mtilerator_1         |�[0m     at normal_reply (/opt/tilerator/node_modules/redis/index.js:721:21)
�[36mtilerator_1         |�[0m     at RedisClient.return_reply (/opt/tilerator/node_modules/redis/index.js:819:9)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.returnReply (/opt/tilerator/node_modules/redis/index.js:192:18)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.execute (/opt/tilerator/node_modules/redis-parser/lib/parser.js:574:12)
�[36mtilerator_1         |�[0m     at Socket.<anonymous> (/opt/tilerator/node_modules/redis/index.js:274:27)
�[36mtilerator_1         |�[0m     at emitOne (events.js:116:13)
�[36mtilerator_1         |�[0m     at Socket.emit (events.js:211:7)
�[36mtilerator_1         |�[0m     at addChunk (_stream_readable.js:263:12)
�[36mtilerator_1         |�[0m     at readableAddChunk (_stream_readable.js:250:11)
�[36mtilerator_1         |�[0m     at Socket.Readable.push (_stream_readable.js:208:10)
�[36mtilerator_1         |�[0m     at TCP.onread (net.js:601:20)
�[36mtilerator_1         |�[0m Error: job "202" is invalid
�[36mtilerator_1         |�[0m     at Command.callback (/opt/tilerator/node_modules/kue/lib/queue/job.js:182:17)
�[36mtilerator_1         |�[0m     at normal_reply (/opt/tilerator/node_modules/redis/index.js:721:21)
�[36mtilerator_1         |�[0m     at RedisClient.return_reply (/opt/tilerator/node_modules/redis/index.js:819:9)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.returnReply (/opt/tilerator/node_modules/redis/index.js:192:18)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.execute (/opt/tilerator/node_modules/redis-parser/lib/parser.js:574:12)
�[36mtilerator_1         |�[0m     at Socket.<anonymous> (/opt/tilerator/node_modules/redis/index.js:274:27)
�[36mtilerator_1         |�[0m     at emitOne (events.js:116:13)
�[36mtilerator_1         |�[0m     at Socket.emit (events.js:211:7)
�[36mtilerator_1         |�[0m     at addChunk (_stream_readable.js:263:12)
�[36mtilerator_1         |�[0m     at readableAddChunk (_stream_readable.js:250:11)
�[36mtilerator_1         |�[0m     at Socket.Readable.push (_stream_readable.js:208:10)
�[36mtilerator_1         |�[0m     at TCP.onread (net.js:601:20)
�[36mtilerator_1         |�[0m Error: job "206" is invalid
�[36mtilerator_1         |�[0m     at Command.callback (/opt/tilerator/node_modules/kue/lib/queue/job.js:182:17)
�[36mtilerator_1         |�[0m     at normal_reply (/opt/tilerator/node_modules/redis/index.js:721:21)
�[36mtilerator_1         |�[0m     at RedisClient.return_reply (/opt/tilerator/node_modules/redis/index.js:819:9)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.returnReply (/opt/tilerator/node_modules/redis/index.js:192:18)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.execute (/opt/tilerator/node_modules/redis-parser/lib/parser.js:574:12)
�[36mtilerator_1         |�[0m     at Socket.<anonymous> (/opt/tilerator/node_modules/redis/index.js:274:27)
�[36mtilerator_1         |�[0m     at emitOne (events.js:116:13)
�[36mtilerator_1         |�[0m     at Socket.emit (events.js:211:7)
�[36mtilerator_1         |�[0m     at addChunk (_stream_readable.js:263:12)
�[36mtilerator_1         |�[0m     at readableAddChunk (_stream_readable.js:250:11)
�[36mtilerator_1         |�[0m     at Socket.Readable.push (_stream_readable.js:208:10)
�[36mtilerator_1         |�[0m     at TCP.onread (net.js:601:20)
�[36mtilerator_1         |�[0m Error: job "196" is invalid
�[36mtilerator_1         |�[0m     at Command.callback (/opt/tilerator/node_modules/kue/lib/queue/job.js:182:17)
�[36mtilerator_1         |�[0m     at normal_reply (/opt/tilerator/node_modules/redis/index.js:721:21)
�[36mtilerator_1         |�[0m     at RedisClient.return_reply (/opt/tilerator/node_modules/redis/index.js:819:9)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.returnReply (/opt/tilerator/node_modules/redis/index.js:192:18)
�[36mtilerator_1         |�[0m     at JavascriptRedisParser.execute (/opt/tilerator/node_modules/redis-parser/lib/parser.js:574:12)
�[36mtilerator_1         |�[0m     at Socket.<anonymous> (/opt/tilerator/node_modules/redis/index.js:274:27)
�[36mtilerator_1         |�[0m     at emitOne (events.js:116:13)
�[36mtilerator_1         |�[0m     at Socket.emit (events.js:211:7)
�[36mtilerator_1         |�[0m     at addChunk (_stream_readable.js:263:12)
�[36mtilerator_1         |�[0m     at readableAddChunk (_stream_readable.js:250:11)
�[36mtilerator_1         |�[0m     at Socket.Readable.push (_stream_readable.js:208:10)
�[36mtilerator_1         |�[0m     at TCP.onread (net.js:601:20)