stephen mallette closed TINKERPOP-1674.
    Resolution: Cannot Reproduce

closing pending additional information (i.e. an easier/more direct approach to 
recreating the problem or something that pins the problem to some particular 
aspect of tinkerpop itself)

> Traversals reference elements after deletion
> --------------------------------------------
>                 Key: TINKERPOP-1674
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1674
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: neo4j
>    Affects Versions: 3.2.3, 3.2.4
>         Environment: Demonstrated on Ubuntu, OSX
>            Reporter: SmedbergM
>            Priority: Major
> In a multiprocessor environment, a traversal will sometimes reference 
> vertices which another thread/processor has already deleted. This causes the 
> entire traversal to fail in an unrecoverable fashion and throw an uncaught 
> exception.
> MWE: https://github.com/SmedbergM/neo4j-deletion-error
> Gist containing logging output: 
> https://gist.github.com/SmedbergM/5fcf0d98a255e7d346b85b98bcc1ec0d
> This error has cropped up persistently over several months/releases (dating 
> back to 3.1.x or earlier). I have not tried to diff back/bisect to find 
> introduction time of the behavior.

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