#vulnerable code 
                                private static String parseNeo4jVersion()
    {
        String[] split = Neo4jRunner.NEOCTRL_ARGS.split( "\\s+" );
        String version = split[split.length - 1];
        ServerVersion serverVersion = ServerVersion.version( NEO4J_PRODUCT + "/" + version );
        assumeTrue( CAUSAL_CLUSTER.availableIn( serverVersion ), "Server version `" + version + "` does not support Casual Cluster" );
        return version;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private static String parseNeo4jVersion()
    {
        String[] split = Neo4jRunner.NEOCTRL_ARGS.split( "\\s+" );
        return split[split.length - 1];
    }