Why am I getting error message via cron relating to apt-xapian-index? Does it provide a -backdoor- into my website?

My concern is that this is software that enables remote access to parts of my website. Possibly part of a plugin from WordPress. Here is the message mailed to me from my domain. I have a very uncomfortable feeling about it.

Traceback (most recent call last):
  File "/usr/sbin/update-apt-xapian-index", line 108, in <module>
  File "/usr/lib/python2.7/dist-packages/axi/", line 744, in rebuild
    self.buildIndex(dbdir, generator)
  File "/usr/lib/python2.7/dist-packages/axi/", line 707, in buildIndex
    db = xapian.WritableDatabase(pathname, xapian.DB_CREATE_OR_OVERWRITE)
  File "/usr/lib/python2.7/dist-packages/xapian/", line 4304, in __init__
xapian.DatabaseLockError: Unable to get write lock on /var/cache/apt-xapian-index/index.3: Couldn't fork: Cannot allocate memory
run-parts: /etc/cron.weekly/apt-xapian-index exited with return code 1

PS. Just because I am paranoid does NOT mean someone is trying to get me. Cheers WebFish, ianm

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