Indexer crash on 4.5 Beta, MacOS

Seen from a customer's Mac laptop:
Service 'indexer' exited with status 1. Restarting. Messages: runtime.goexit()
/Users/jenkins/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc8200d07c0 sp=0xc8200d07b8
created by github.com/couchbase/indexing/secondary/indexer.(*mutationMgr).run
/Users/jenkins/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/mutation_manager.go:109 +0x86
[goport] 2016/05/28 06:05:43 /Users/scott/Desktop/Couchbase Server.app/Contents/Resources/couchbase-core/bin/indexer terminated: exit status 2

Just want to confirm whether this is a known issue and already fixed in a later build or something else we need to look into.