Packetbeat use pipeline auto stop 5.6.4

[zqc0512 (andy_zhou)]

one instance is auto stop ,the other instance is can running..

[root@hostname packetbeat-5.6.4-linux-x86_64]# ./packetbeat 
panic: runtime error: index out of range

goroutine 25 [running]:
panic(0xadbb60, 0xc42000c120)
        /usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP.(*GeoIP).lookupByIPNum(0xc4212ee390, 0xb0ba542, 0x0)
        /go/src/github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP/libgeo.go:295 +0x17f
github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP.(*GeoIP).GetLocationByIPNum(0xc4212ee390, 0xb0ba542, 0xc40b0ba542)
        /go/src/github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP/libgeo.go:211 +0x3a
github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP.(*GeoIP).GetLocationByIP(0xc4212ee390, 0xc420f7d8e0, 0xc, 0xc421899c08)
        /go/src/github.com/elastic/beats/vendor/github.com/nranchev/go-libGeoIP/libgeo.go:205 +0x4b
github.com/elastic/beats/packetbeat/publish.(*PacketbeatPublisher).addGeoIPToFlow.func1(0xc422b3d680, 0xba69f5, 0x2, 0x4, 0xc421ba8d28)
        /go/src/github.com/elastic/beats/packetbeat/publish/publish.go:272 +0xe6
github.com/elastic/beats/packetbeat/publish.(*PacketbeatPublisher).addGeoIPToFlow(0xc42011b7a0, 0xc422b3d650, 0xba83bc)
        /go/src/github.com/elastic/beats/packetbeat/publish/publish.go:296 +0x2ca
github.com/elastic/beats/packetbeat/publish.(*PacketbeatPublisher).onFlow(0xc42011b7a0, 0xc42187c000, 0x6a, 0x400)
        /go/src/github.com/elastic/beats/packetbeat/publish/publish.go:154 +0x204
github.com/elastic/beats/packetbeat/publish.(*PacketbeatPublisher).Start.func2(0xc42011b7a0)
        /go/src/github.com/elastic/beats/packetbeat/publish/publish.go:121 +0x155
created by github.com/elastic/beats/packetbeat/publish.(*PacketbeatPublisher).Start
        /go/src/github.com/elastic/beats/packetbeat/publish/publish.go:124 +0x9e