[Windows] : panic: value method opentracing.noopSpan.Finish called using nil *noopSpan pointer

python testrunner.py -i /tmp/testexec.3877.ini -c eventing/eventing_rebalance.conf -p get-cbcollect-info=True,GROUP=bucket_op_with_timers

panic: value method opentracing.noopSpan.Finish called using nil *noopSpan pointer

goroutine 853 [running]:

panic(0xc86680, 0xc046090ca0)

        C:/Users/Administrator/cbdepscache/exploded/amd64/go-1.7.6/go/src/runtime/panic.go:500 +0x1af fp=0xc045fad548 sp=0xc045fad4b8

runtime.panicwrap(0xd9d085, 0xb, 0xd9a341, 0x8, 0xd97287, 0x6)

        C:/Users/Administrator/cbdepscache/exploded/amd64/go-1.7.6/go/src/runtime/error.go:96 +0x131 fp=0xc045fad628 sp=0xc045fad548

github.com/opentracing/opentracing-go.(*noopSpan).Finish(0x0)

        <autogenerated>:27 +0x9c fp=0xc045fad668 sp=0xc045fad628

gopkg.in/couchbase/gocbcore%2ev7.(*Agent).cancelReqTrace(0xc043d18b40, 0xc04433dc20, 0x132f680, 0xc042124bb0)

        godeps/src/gopkg.in/couchbase/gocbcore.v7/tracing.go:118 +0x74 fp=0xc045fad680 sp=0xc045fad668

gopkg.in/couchbase/gocbcore%2ev7.(*memdQRequest).Cancel(0xc04433dc20, 0xc04551eb01)

        godeps/src/gopkg.in/couchbase/gocbcore.v7/memdqpackets.go:104 +0xc3 fp=0xc045fad6b0 sp=0xc045fad680

github.com/couchbase/gocb.(*opManager).Wait(0xc045636f60, 0x1333000, 0xc04433dc20, 0x0, 0x0, 0x13c26a0, 0xc043beb260)

        godeps/src/github.com/couchbase/gocb/bucket_crud.go:164 +0x1b1 fp=0xc045fad798 sp=0xc045fad6b0

github.com/couchbase/gocb.(*Bucket).get(0xc0437f0280, 0x1334b80, 0x13c26a0, 0xc044313080, 0x5e, 0xc176e0, 0xc043d60300, 0xc043aef200, 0x3f, 0xc0442c99b8)

        godeps/src/github.com/couchbase/gocb/bucket_crud.go:216 +0x28e fp=0xc045fad848 sp=0xc045fad798

github.com/couchbase/gocb.(*Bucket).Get(0xc0437f0280, 0xc044313080, 0x5e, 0xc176e0, 0xc043d60300, 0x0, 0x0, 0x0)

        godeps/src/github.com/couchbase/gocb/bucket_crud.go:13 +0x10e fp=0xc045fad8b8 sp=0xc045fad848

github.com/couchbase/eventing/consumer.glob..func7(0xc043ff5a40, 0x5, 0x5, 0x1, 0x1)

        goproj/src/github.com/couchbase/eventing/consumer/bucket_ops.go:211 +0x1f5 fp=0xc045fada78 sp=0xc045fad8b8

github.com/couchbase/eventing/util.Retry(0x1337bc0, 0xc0452b41e8, 0xc0421f75d8, 0xe46ba0, 0xc043ff5a40, 0x5, 0x5, 0x0, 0x0)

        goproj/src/github.com/couchbase/eventing/util/retry.go:65 +0x6a fp=0xc045fadae8 sp=0xc045fada78

github.com/couchbase/eventing/consumer.(*Consumer).cleanupProcessedCronTimers(0xc042bc4000)

        goproj/src/github.com/couchbase/eventing/consumer/timer_events.go:603 +0x4bb fp=0xc045fadf88 sp=0xc045fadae8

runtime.goexit()

        C:/Users/Administrator/cbdepscache/exploded/amd64/go-1.7.6/go/src/runtime/asm_amd64.s:2086 +0x1 fp=0xc045fadf90 sp=0xc045fadf88

created by github.com/couchbase/eventing/consumer.(*Consumer).Serve

        goproj/src/github.com/couchbase/eventing/consumer/v8_consumer.go:311 +0x1cb8