[XDCR] panic: runtime error: slice bounds out of range

panic: runtime error: slice bounds out of range

goroutine 163 [running]:

github.com/couchbase/goxdcr/parts.(*Router).ComposeMCRequest(0xc0001e12d0, 0xc0006361c0, 0xc0006361c4, 0xc000385918, 0xc00029c301)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/parts/router.go:159 +0x3d1

github.com/couchbase/goxdcr/parts.(*Router).route(0xc0001e12d0, 0xab5ce0, 0xc0006361c0, 0xc000560100, 0xc00062ab18, 0xc00062aaa8)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/parts/router.go:221 +0x100

github.com/couchbase/goxdcr/parts.(*Router).route-fm(0xab5ce0, 0xc0006361c0, 0xc0002bf758, 0x3, 0xc000032070)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/parts/router.go:109 +0x3e

github.com/couchbase/goxdcr/connector.(*Router).Forward(0xc0002bf740, 0xab5ce0, 0xc0006361c0, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/connector/router.go:60 +0xfb

github.com/couchbase/goxdcr/parts.(*DcpNozzle).processData(0xc00020e1e0, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:849 +0x1623

created by github.com/couchbase/goxdcr/parts.(*DcpNozzle).Start

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/goxdcr/parts/dcp_nozzle.go:560 +0x3e5