panic: Cannot call SliceContains on a non-slice "Sam-Helman-MacBook-Pro.local:20000" of kind "string"

goroutine 46 [running]:
runtime.panic(0x1c8da0, 0xc20811f740)
	/Users/sam/tengen/mci/src/go/src/pkg/runtime/panic.c:279 +0xf5
github.com/mongodb/mongo-tools/common/util.SliceContains(0x1c8da0, 0xc20811f710, 0x1be140, 0xc208111a40, 0x3)
	/Users/sam/tengen/mongo-tools/.gopath/src/github.com/mongodb/mongo-tools/common/util/slice.go:17 +0x21d
github.com/mongodb/mongo-tools/mongostat.NewStatLine(0xecbedc6e9, 0x202ef71, 0x3bf920, 0xc20811cf00, 0x22, 0xc20812b482, 0xa, 0xc20812b4a8, 0x6, 0x8cbf, ...)
	/Users/sam/tengen/mongo-tools/.gopath/src/github.com/mongodb/mongo-tools/mongostat/stat_types.go:700 +0xf63
github.com/mongodb/mongo-tools/mongostat.(*NodeMonitor).Report(0xc20801b360, 0xc208013200, 0x0, 0xc2080042a0, 0x1)
	/Users/sam/tengen/mongo-tools/.gopath/src/github.com/mongodb/mongo-tools/mongostat/mongostat.go:237 +0x4f2
github.com/mongodb/mongo-tools/mongostat.func·003()
	/Users/sam/tengen/mongo-tools/.gopath/src/github.com/mongodb/mongo-tools/mongostat/mongostat.go:271 +0xa4
created by github.com/mongodb/mongo-tools/mongostat.(*NodeMonitor).Watch
	/Users/sam/tengen/mongo-tools/.gopath/src/github.com/mongodb/mongo-tools/mongostat/mongostat.go:275 +0xdb