eventing panic in centos longevity

5.5.4-4327 - centos longevity - following panic observed in eventing logs:

2019-03-12T05:21:50.109-07:00 [Error] Consumer::addToAggChan [worker_bucket_op_function_2:/tmp/127.0.0.1:8091_worker_bucket_op_function_2.sock:30236] addToAggChan: recover send on closed channel stack trace: goroutine 489026 [running]:
runtime/debug.Stack(0xc426f3cc98, 0xc80240, 0xc4345736b0)
/home/couchbase/.cbdepscache/exploded/x86_64/go-1.7.6/go/src/runtime/debug/stack.go:24 +0x79
github.com/couchbase/eventing/consumer.(*Consumer).addToAggChan.func1.1(0xda1717, 0x16, 0xc42a1baa00)
goproj/src/github.com/couchbase/eventing/consumer/process_events.go:775 +0x6e
panic(0xc80240, 0xc4345736b0)
/home/couchbase/.cbdepscache/exploded/x86_64/go-1.7.6/go/src/runtime/panic.go:458 +0x243
github.com/couchbase/eventing/consumer.(*Consumer).addToAggChan.func1(0xda1717, 0x16, 0xc42a1baa00, 0xc429e8e630)
goproj/src/github.com/couchbase/eventing/consumer/process_events.go:808 +0x145
created by github.com/couchbase/eventing/consumer.(*Consumer).addToAggChan
goproj/src/github.com/couchbase/eventing/consumer/process_events.go:812 +0x5e
2019-03-12T05:21:50.135-07:00 [Info] Consumer::processEvents [worker_bucket_op_function_2:/tmp/127.0.0.1:8091_worker_bucket_op_function_2.sock:30236] Exiting processEvents routine
2019-03-12T05:21:50.147-07:00 [Info] DCPT[eventing:tbahHeMq-17251:{eventing:tbahHeMq-17246:1

logs: https://supportal.couchbase.com/snapshot/b084da633a3d54d97b6ccb3516494f8b::0